The Google Calendar issue is really just another account conflict issue. Users who want to continue using their Google Calendars will need to share the calendars between their old, transitioned account and there new school/trust Google Apps account.

If you aren't familiar with Google Calendar and how to share calendar, This Google-produced video is a great overview of the various sharing options in Calendar: If you’d like specific directions on how to share one calendar from your old, transitioned account to your new Google Apps account, please see these instructions: