As for Neil Young, he does have a tour date for Friday, May 25, except all of the dates around that one are in Europe. Not sure, but he does have the means to just fly around so who knows! I just don't think that he would be a Friday night headliner, more like Sunday.
Disclosure is playing Primavera on Friday, Field Day on Saturday and are supposed to play Sasquatch on Monday. Totally doable. Plus the date came from their booking agents, which had Coachella, Primavera and Osheaga also listed.