LCD, Wet Leg and Fontaines all but impossible with them playing Primavera sadly, think Caribou might be too. Vampire Weekend seem to be around the other end of the Summer sadly but the others could be added
Well people dont buy tickets for just the headliner, I think muse can still move 30-40k
rest of tickets for the rest of the acts, you have a sold out day (Plus nos alive is known to give away a ton of tickets to brands, even if the line up is weak, the venue will be full for sure)