I've got a hosted SP2007 environment. I don't know much about this site but I was asked to delete a duplication in the workspace. I'm not sure how. This is what I'm looking at. There are two dates with 10/25/2013, I need to remove one of those, not sure how.
Actual solution: this list is a hidden list within the workspace that has permissions locked down hard. Crashed my SPD multiple times and corrupted my test meeting workspace as I tried to mess with it. Here is one solution through Visual Studio.
Original, incorrect text: You need to go into the Calendar, see if there are two meetings on the 15th, and delete one of them. If that's a recurring meeting, then you likely only have 1 workspace for the set. If that's the case, don't delete the workspace, only the calendar item! Verify by going to All Site Content and looking at what workspaces are listed.