Possibly, but of course. The event schedule will go as it is. Say if 6:30 started, it will most likely finish at 7:30. Of course the 8:30 need to happen. Depends on the Event idea.
We could be doing Campaign mission that can last for 2hrs, if the EM see fits.
Late Night opertaions can be done, after the 8:30 event is over. That could be something EM could host or other Staff.
There could be future ARCR Opertaion happening on the event server, something ARC could host.
As normal events, I don't think it will be longer. But as Campaigns, Late Night, Operations. Most likely will.