diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 7d373b76ff..83c8730ef3 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -6,13 +6,13 @@
       <Uri>https://dev.azure.com/microsoft/ProjectReunion/_git/WindowsAppSDK</Uri>
       <Sha>f51f55b53b094d28a8fb117fe79fa354a3287c3b</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.ProjectReunion.InteractiveExperiences.TransportPackage" Version="1.5.4-CI-26105.1010.240927-1621.0">
+    <Dependency Name="Microsoft.ProjectReunion.InteractiveExperiences.TransportPackage" Version="1.5.4-CI-26105.1011.241025-1113.31">
       <Uri>https://dev.azure.com/microsoft/LiftedIXP/_git/DCPP</Uri>
-      <Sha>943a920dac1612ac395a09f42af287a08e6eddac</Sha>
+      <Sha>26df64c7fa2693f44c179a7ba4c9df3257b76865</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Internal.InteractiveExperiences" Version="1.5.4-CI-26105.1010.240927-1621.0">
+    <Dependency Name="Microsoft.Internal.InteractiveExperiences" Version="1.5.4-CI-26105.1011.241025-1113.31">
       <Uri>https://dev.azure.com/microsoft/LiftedIXP/_git/DCPP</Uri>
-      <Sha>943a920dac1612ac395a09f42af287a08e6eddac</Sha>
+      <Sha>26df64c7fa2693f44c179a7ba4c9df3257b76865</Sha>
     </Dependency>
     <!-- Microsoft-WinUI-SDK repo (MSBuild and Visual Studio extensions for building, deploying, and debugging packaged applications.)  -->
     <Dependency Name="Microsoft.Build.Msix" Version="1.5.0-zmain.240510.2">
diff --git a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.cs b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.cs
index 10cd4f1524..da91e55650 100644
--- a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.cs
+++ b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.cs
@@ -598,8 +598,8 @@ private void Output_GetBindingConnectorCase(ConnectionIdElement element, bool is
      }
      private void Output_GetBindingConnectorMethod()
      {
-this.Write("        /// <summary>\r\n        /// GetBindingConnector(int connectionId, object t" +
-        "arget)\r\n        /// </summary>\r\n        ");
+this.Write("\r\n        /// <summary>\r\n        /// GetBindingConnector(int connectionId, object" +
+        " target)\r\n        /// </summary>\r\n        ");
 
 this.Write(this.ToStringHelper.ToStringWithCulture(GeneratedCodeAttribute));
 
@@ -1098,41 +1098,8 @@ private void Output_BindingsClasses()
                  foreach (BoundEventAssignment evt in element.BoundEventAssignments)
                  {
                      Output_ApiInformationCall_Push(evt.ApiInformation, Indent.ThreeTabs); 
-this.Write("                        this.");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.EventHandlerCodeName));
-
-this.Write(" = (");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.Declaration()));
-
-this.Write(") =>\r\n                        {\r\n");
-
-                     PushIndent();
-                     if (!evt.PathStep.ValueType.IsDelegate())
-                     {
-this.Write("                        ");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
-
-this.Write(";\r\n");
-
-                     }
-                     else
-                     {
-this.Write("                        ");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
-
-this.Write("(");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.ForCall()));
-
-this.Write(");\r\n");
-
-                     }
-                     PopIndent();
-this.Write("                        };\r\n                        (");
+                     Output_NullCheckedEventAssignment(evt); 
+this.Write("                        (");
 
 this.Write(this.ToStringHelper.ToStringWithCulture(ObjectCast(element.Type.ToString(), "target")));
 
@@ -2744,6 +2711,54 @@ void  Output_NullCheckedAssignment(BindPathStep step, LanguageSpecificString val
      } 
      PopIndent();
  } 
+ void  Output_NullCheckedEventAssignment(BoundEventAssignment evt) 
+ { 
+this.Write("                        this.");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.EventHandlerCodeName));
+
+this.Write(" = (");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.Declaration()));
+
+this.Write(") =>\r\n                        {\r\n");
+
+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { 
+this.Write("                            if (");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(parent.CodeGen().PathExpression));
+
+this.Write(" != null)\r\n                            {\r\n");
+
+         PushIndent(); 
+     } 
+     if (!evt.PathStep.ValueType.IsDelegate()) { 
+this.Write("                            ");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
+
+this.Write(";\r\n");
+
+     } else { 
+this.Write("                            ");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
+
+this.Write("(");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.ForCall()));
+
+this.Write(");\r\n");
+
+     } 
+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { 
+         PopIndent(); 
+this.Write("                            }\r\n");
+
+     } 
+this.Write("                        };\r\n");
+
+ } 
  void Output_UpdateErrors(BindUniverse bindUniverse) 
  { 
      var twoWayWithIndeiSteps =  bindUniverse.INDEIPathSteps; 
diff --git a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.tt b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.tt
index f49177d569..2c3abe1527 100644
--- a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.tt
+++ b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CSharpPagePass2.tt
@@ -318,6 +318,7 @@ namespace <#=Model.CodeInfo.ClassName.Namespace#>
 
 <#+     private void Output_GetBindingConnectorMethod()#>
 <#+     {#>
+
         /// <summary>
         /// GetBindingConnector(int connectionId, object target)
         /// </summary>
@@ -561,19 +562,7 @@ namespace <#=Model.CodeInfo.ClassName.Namespace#>
 <#+                 foreach (BoundEventAssignment evt in element.BoundEventAssignments)#>
 <#+                 {#>
 <#+                     Output_ApiInformationCall_Push(evt.ApiInformation, Indent.ThreeTabs); #>
-                        this.<#=evt.EventHandlerCodeName#> = (<#=evt.Parameters.Declaration()#>) =>
-                        {
-<#+                     PushIndent();#>
-<#+                     if (!evt.PathStep.ValueType.IsDelegate())#>
-<#+                     {#>
-                        <#=evt.PathStep.CodeGen().PathExpression#>;
-<#+                     }#>
-<#+                     else#>
-<#+                     {#>
-                        <#=evt.PathStep.CodeGen().PathExpression#>(<#=evt.Parameters.ForCall()#>);
-<#+                     }#>
-<#+                     PopIndent();#>
-                        };
+<#+                     Output_NullCheckedEventAssignment(evt); #>
                         (<#=ObjectCast(element.Type.ToString(), "target")#>).<#=evt.MemberName#> += <#=evt.EventHandlerCodeName#>;
 <#+                     Output_ApiInformationCall_Pop(evt.ApiInformation, Indent.ThreeTabs); #>
 <#+                 }#>
@@ -1473,6 +1462,27 @@ namespace <#=Model.CodeInfo.ClassName.Namespace#>
 <#+     PopIndent();#>
 <#+ } #>
 
+<#+ void  Output_NullCheckedEventAssignment(BoundEventAssignment evt) #>
+<#+ { #>
+                        this.<#=evt.EventHandlerCodeName#> = (<#=evt.Parameters.Declaration()#>) =>
+                        {
+<#+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { #>
+                            if (<#=parent.CodeGen().PathExpression#> != null)
+                            {
+<#+         PushIndent(); #>
+<#+     } #>
+<#+     if (!evt.PathStep.ValueType.IsDelegate()) { #>
+                            <#=evt.PathStep.CodeGen().PathExpression#>;
+<#+     } else { #>
+                            <#=evt.PathStep.CodeGen().PathExpression#>(<#=evt.Parameters.ForCall()#>);
+<#+     } #>
+<#+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { #>
+<#+         PopIndent(); #>
+                            }
+<#+     } #>
+                        };
+<#+ } #>
+
 <#+ void Output_UpdateErrors(BindUniverse bindUniverse) #>
 <#+ { #>
 <#+     var twoWayWithIndeiSteps =  bindUniverse.INDEIPathSteps; #>
diff --git a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.cs b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.cs
index c57240691c..cfdddc647c 100644
--- a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.cs
+++ b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.cs
@@ -633,37 +633,7 @@ private void Output_ConnectionId_Case(ConnectionIdElement element)
 
      foreach (BoundEventAssignment evt in element.BoundEventAssignments) { 
          Output_ApiInformationCall_Push(evt.ApiInformation, Indent.ThreeTabs); 
-this.Write("                    targetElement.");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.MemberName));
-
-this.Write("([this](");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.Declaration()));
-
-this.Write(")\r\n                    {\r\n");
-
-         if (!evt.PathStep.ValueType.IsDelegate()) { 
-this.Write("                        ");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
-
-this.Write(";\r\n");
-
-         } else { 
-this.Write("                        ");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
-
-this.Write("(");
-
-this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.ForCall()));
-
-this.Write(");\r\n");
-
-         }
-this.Write("                    });\r\n");
-
+         Output_NullCheckedEventAssignment(evt); 
          Output_ApiInformationCall_Pop(evt.ApiInformation, Indent.ThreeTabs); 
      }
      if (element.CanBeInstantiatedLater && (element.HasBindAssignments || element.HasBoundEventAssignments))
@@ -847,6 +817,56 @@ void  Output_NullCheckedAssignment(BindPathStep step, LanguageSpecificString val
 
      } 
      PopIndent();
+ } 
+ void  Output_NullCheckedEventAssignment(BoundEventAssignment evt) 
+ { 
+this.Write("                    targetElement.");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.MemberName));
+
+this.Write("([this](");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.Declaration()));
+
+this.Write(")\r\n                    {\r\n");
+
+     PushIndent(Indent.ThreeTabs);
+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { 
+this.Write("            if (");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(parent.CodeGen().PathExpression));
+
+this.Write(" != nullptr)\r\n            {\r\n");
+
+         PushIndent(); 
+     } 
+     if (!evt.PathStep.ValueType.IsDelegate()) { 
+this.Write("            ");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
+
+this.Write(";\r\n");
+
+     } else { 
+this.Write("            ");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.PathStep.CodeGen().PathExpression));
+
+this.Write("(");
+
+this.Write(this.ToStringHelper.ToStringWithCulture(evt.Parameters.ForCall()));
+
+this.Write(");\r\n");
+
+     }
+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { 
+         PopIndent(); 
+this.Write("            }\r\n");
+
+     } 
+     PopIndent();
+this.Write("                    });\r\n");
+
  } 
      private void Output_UpdateChildListeners_Call(BindPathStep step, string parameter)
      {
diff --git a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.tt b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.tt
index 082f340f04..0b9983b38b 100644
--- a/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.tt
+++ b/src/XamlCompiler/BuildTasks/Microsoft/Xaml/XamlCompiler/CodeGenerators/CppWinRT/CppWinRT_PageBinding.tt
@@ -525,14 +525,7 @@
                     <#=element.ObjectCodeName#> = targetElement;
 <#+     foreach (BoundEventAssignment evt in element.BoundEventAssignments) { #>
 <#+         Output_ApiInformationCall_Push(evt.ApiInformation, Indent.ThreeTabs); #>
-                    targetElement.<#=evt.MemberName#>([this](<#=evt.Parameters.Declaration()#>)
-                    {
-<#+         if (!evt.PathStep.ValueType.IsDelegate()) { #>
-                        <#=evt.PathStep.CodeGen().PathExpression#>;
-<#+         } else { #>
-                        <#=evt.PathStep.CodeGen().PathExpression#>(<#=evt.Parameters.ForCall()#>);
-<#+         }#>
-                    });
+<#+         Output_NullCheckedEventAssignment(evt); #>
 <#+         Output_ApiInformationCall_Pop(evt.ApiInformation, Indent.ThreeTabs); #>
 <#+     }#>
 <#+     if (element.CanBeInstantiatedLater && (element.HasBindAssignments || element.HasBoundEventAssignments))#>
@@ -638,6 +631,29 @@
 <#+     PopIndent();#>
 <#+ } #>
 
+<#+ void  Output_NullCheckedEventAssignment(BoundEventAssignment evt) #>
+<#+ { #>
+                    targetElement.<#=evt.MemberName#>([this](<#=evt.Parameters.Declaration()#>)
+                    {
+<#+     PushIndent(Indent.ThreeTabs);#>
+<#+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { #>
+            if (<#=parent.CodeGen().PathExpression#> != nullptr)
+            {
+<#+         PushIndent(); #>
+<#+     } #>
+<#+     if (!evt.PathStep.ValueType.IsDelegate()) { #>
+            <#=evt.PathStep.CodeGen().PathExpression#>;
+<#+     } else { #>
+            <#=evt.PathStep.CodeGen().PathExpression#>(<#=evt.Parameters.ForCall()#>);
+<#+     }#>
+<#+     foreach (var parent in evt.PathStep.Parents.Where(parent => parent.NeedsCheckForNull)) { #>
+<#+         PopIndent(); #>
+            }
+<#+     } #>
+<#+     PopIndent();#>
+                    });
+<#+ } #>
+
 <#+     private void Output_UpdateChildListeners_Call(BindPathStep step, string parameter)#>
 <#+     {#>
 <#+         if (step.NeedsUpdateChildListeners)#>