How can I add two due dates to an assignment? For instance, in a Discussion, I would like to set a due date for the first post, and then a second due date for all response posts. Is there a way to do this?
You cannot do this directly, although there is a feature idea that is asking for it. Multiple Due Dates (checkpoints) for Discussions
There are lots of suggestions and possible work-arounds in the discussions at that feature idea, including one where I use an ungraded assignment as the second due date.
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