I had the same issue. This was posted by "natrona111" on here...(I used it on "calendar" and "calendar storage" then re-sync'd w/outlook and it worked for me as well):
"After I received the update to Android 2.1, my Google calendar was not syncing with my phone anymore, and I kept receiving the "force close" message for com.htc.bgp and com.htc.calendar.
I went to Settings >> Applications >> Manage applications and selected "Clear cache" and "Clear data" for (where applicable):