Calendar and facebook events and birthdays
Check that you have the calendar selected: go to Settings -&gt; Accounts and Sync -&gt; [your Facebook account] and make sure Sync calendar is selected. On some phones there might be a builtin Facebook sync which only takes care of the names, so if there is no Sync Calendar option, go to Add account and see if you have Facebook under Integrated contact accounts and More accounts. If so, add the one from More accounts and check Sync Calendar.

Edit: The problem can be fixed by removing and readding both sync accounts, waiting for the phone to remove them in between.