Usually, but not always as in this case, source control bindings are removed from the VS solution file prior to creating the source package. They can be easily removed by editing the VS solution file (DotNetNuke.Events.sln) in NotePad or other text editor prior to opening the solution in VS.

Remove this entire section and re-save the file:

GlobalSection(TeamFoundationVersionControl) = preSolution
  SccNumberOfProjects = 2

  . . . . . . . . . . . . . . . . . . . . .

  SccProvider1 = {4CA58AB2-18FA-4F8D-95D4-32DDF27D184C}
 EndGlobalSection

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

The DotNetNuke.Events.vbproj file imports an MSBuild targets file, "Install\Project.targets" which requires that MSBuild Community Tasks be installed. This allows the project, when built in release configuration, to update the DNN manifest and package itself into source and install versions. If you have not installed MSBuild Community Tasks or if it's assembly is not located in the default MSBuildExtensionsPath (C:\ProgramFiles\MSBuild\MSBuildCommunityTasks for 32 bit installations or or C:\ProgramFiles(x86)\MSBuild\MSBuildCommunityTasks for 64bit installations) the project filee cannot be loaded. If you do not want to take advantage of this custom build environment, you could comment out or delete the following line from DotNetNuke.Events.vbproj:

<Import Project="$(MSBuildProjectDirectory)\Installation\Project.targets" />

I also noticed additional source control binding information in the DotNetNuke.Events.vbproj file. Although I don't believe these will cause the project not to be loaded, you might as well remove them

<SccProjectName>SAK</SccProjectName>
<SccLocalPath>SAK</SccLocalPath>
<SccAuxPath>SAK</SccAuxPath>
<SccProvider>SAK</SccProvider>

They are located in the first <PropertyGroup> section.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner