Every spring, two weekends in the California desert set the agenda for the rest of the festival calendar. Glastonbury has the history and Primavera has the taste, but Coachella has the reach. No other festival makes this many people care this much about a poster, and the 2027 version arrived Tuesday night.If you followed the speculation, the headliners won’t surprise you. That’s partly because SZA gave away the game earlier in the week. Here’s…