They can play on Hurricane/Southside od June 21/22 like Ed Sheeran this year.
But 3 days in a row is also doubtful, they haven't done it on this tour.
So far ruled out:
Iron Maiden, Gojira, BMTH, Sabaton, Green Day, SOAD.
It's going to be really weak year in terms of headliners; possible options are:
Slipknot, Scorpions, Judas Priest, Korn, Deftones, and three bands without dates; NIN, Volbeat, Slayer