I went to a socially distanced festival in mid September last year (Clockwork Orange), where you had to stay inside an individual roped off section with hay bales, with a maximum of 6 people. It didn't matter if you knew each other or you were from the same household etc, and you were free to walk to the bar and toilets and even change "pods'. Relatively speaking, it was a good day dancing gurned up in a sunny field to Dj's playing tunes, although there was a steady stream of people getting chucked out and lots of brawls between punters and security the more people got fucked and flouted the rules, however vague they were.
Given this second wave has come a few months earlier than the first, I can see these type of events with a few thousand people up and running by the height of summer. Obviously all depends on new variants etc, but with the vaccinations going full pelt, it may not be too much of a crazy thought?