Regardless the big winner are the theaters i'd say, the small chain i work at is keeping >50% of the ticket revenue and i'd assume that's pretty common.
Going from a Friday about 30mil lower than Endgame to a Saturday 5mil higher and a Sunday 25mil higher would be rather impressive.
Probably still not as impressive as a 70mil Friday with showings starting at 6PM though.
What? Endgame had 60mil previews and a nearly 97.5mil pure Friday. A 50mil Friday would be 1/3rd of Endgame's Friday since the concert won't have thursday previews rolled in