diff --git a/BeckmanComms.Api.DataTransferObjects/BeckmanComms.Api.DataTransferObjects.nuspec b/BeckmanComms.Api.DataTransferObjects/BeckmanComms.Api.DataTransferObjects.nuspec
index 4016718898bbac58f9222b63cfc8bda6f981c06a..889713ec3a65104d9537234cb9390cb611cb61ae 100644
--- a/BeckmanComms.Api.DataTransferObjects/BeckmanComms.Api.DataTransferObjects.nuspec
+++ b/BeckmanComms.Api.DataTransferObjects/BeckmanComms.Api.DataTransferObjects.nuspec
@@ -13,6 +13,7 @@
     <releaseNotes>
       unreleased:
       * Add nullable EventDto recurrence ID.
+      * Make EventDto.EndDate nullable.
       
       2.0.0-alpha08:
       * Add group type property to GroupDto.
diff --git a/BeckmanComms.Api.DataTransferObjects/V2/Events/EventDto.cs b/BeckmanComms.Api.DataTransferObjects/V2/Events/EventDto.cs
index 852038fbec2f4c91785f345efdf5d2dd82a7dff9..6a39b5f5f5729f0941d744d6a1324569c668bc10 100644
--- a/BeckmanComms.Api.DataTransferObjects/V2/Events/EventDto.cs
+++ b/BeckmanComms.Api.DataTransferObjects/V2/Events/EventDto.cs
@@ -35,7 +35,7 @@ namespace BeckmanComms.Api.DataTransferObjects.V2.Events
         /// <summary>
         /// Ending date and time of event.
         /// </summary>
-        public DateTime EndDate { get; set; }
+        public DateTime? EndDate { get; set; }
 
         /// <summary>
         /// Event location.