There are a lot of people in this world, and it seems as if most of them were at the Coachella Valley Music and Arts Festival last weekend. A logistical puzzle, certainly, and one that requires feedback in order to improve. The festival continues next weekend in Indio, so now's a good time for a mid-festival debriefing. What didn't work? What could be better? What follows are 10 modest proposals for promoter Goldenvoice that could add more sparkle to the festival.