I think they poach acts they see in the circus/theatre areas and get them to do a late night performance for them (so the lineup isn't known very far in advance). So yeah, it's pretty much an old school variety show.
Yes - Arpenaz 4.1. Bigger than expected, but stand up porch could be handy.
My ancient old tent was at sauna temperature by 7am last year so hoping the blackout will help with that and I can get a bit more sleep.