I am wary of online commenters on news sites, but I've been to enough #raves until late 00s (in both London/SE England and #EastAnglia to believe the one who pointed out #ravers were still on site by 18:00 Sunday).
This is the weak point (and allowed #Police to take action, confiscating the sound equipment and busting folk for #DUI) - a new shift of cops (with a lot of Specials) against knackered sleep deprived ravers are obviously going to win any confrontation..
In 90s/00s what happened more often is the rave wound down about 10:00-12:00 and everyone dispersed and cleared up the area - and old bill pretty much left crews and partyfolk alone to do that rather than get the next shift ready for heavy stuff, but with todays DUI laws that may not be possible >>
https://archive.ph/HTqy5