Yes. People trek in and out all day and night. The big issue will be leaving the event at the end of the night as traffic is an absolute nightmare on the causeway. If I were you I'd book a room at Breakers so you wouldn't have to deal with that.
I dunno how accurate Reddit is being, but what should I expect for crowds on Friday and Saturday next week? I expect it to be busy, but their stories are making it sound like you'll be waiting for so long for rides that you'll do basically nothing
Sounds about right unfortunately :/ I’d splurge the really high markup on a Fast Lane if you only get to go every few years. Even then, the Fast Lane lines will still probably be 15-30 minutes for the most popular of rides.