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Today, it is possible to submit talks to past conferences. I just submitted a talk to ECon 2009. I'll use the end_date of the conference to turn off new submissions. Editing existing submissions will always be allowed (to enable adding slides, etc).
Created attachment 183306 [details] Patch This ought to do it.
Committed and deployed, looks like it works.
The program committee and organizers (i.e., me, anne, MeetGreen, etc) will need to be able to add submissions for sponsors, lunches, etc, right up to the end of the conference.
Right up to, but not past, right?
I can't think of any reasons to submit things after the event.