Status update (6/5): We're removing blanket permissions to edit event items today. Again, if you haven't been following this issue, this will mean that henceforth you can only edit events in groups of which you are a member. Please let us know if you have trouble editing events.
Status update (4/12): The system has been stable for a couple of weeks, though we're continuing to pare down the Mercury issue queue. If you have issues you want to see addressed, this is place to go. You can follow issues and see when we have updates or solutions. If you have an issue that is not already the queue, you can add it directly there or email firstname.lastname@example.org. If you have had problems regarding event times, disappearing keywords and/or categories, or problems with data feeding to your site, check our quick fixes to common problems page.