event end
Typically when registration for an event ends, we're given time to finish our current run. When registration for the Innistrad sealed event end at 8:00am Pacific this morning it also prevented me from continuing my current run. (I was 2-0 at the time, so my run would not typically end at that point.)
1) Assuming it was intentional for all in-progress runs to be cancelled at the same time as registration ended, it would have been helpful if the "Registration ends at ..." message on the event page had specified that intent. I would not have started a new run so close to the registration deadline if I had known that I would not be permitted to complete it.
2) When Arena cancels an in-progress run, it would be helpful if it provided a message indicating the rewards received, if any. I don't recall my gem total prior to entering the event, so I'm not sure if I received any payout.