This is basically the reverse of Should bug-report/feature-request *questions* that duplicate Grab-bag *answers* be closed as duplicates?
From time to time, staff members post announcements questions here with the intention of gathering feedback in the form of answers. A recent example is Review queue workflows - Final release which ends with
Feedback
Please leave your feedback and any bugs you may discover related to this release below this post. We will be monitoring this post until Friday, September 10th. Report any further issues after September 10th as new questions on Meta.
Probably not everybody is reading until the end (granted, it is a rather large question) and seven answers have been posted since the deadline. Note that none of them have received a red status badge (which doesn't mean they haven't been addressed). Instead of having to comment to the authors of those answers that they should post a new question instead (which happened today), should we preemptively close the announcement the day after the deadline, as it will not 'accept' new answers anymore? This is similar to how contests like Time for some more swag! have been closed. It should still be possible to vote on or to edit posts, for status updates or clarifications by the authors.
Apparently there is an exception for maintenance announcements, but those are not as inviting to post new answers to as feature announcements are.