I considered Burning Man as an alternative but Coachella's content and timing fit better. Coachella's more music-centric and Burning Man being towards the end of summer conflicted with my goal of making it a bonding experience between Chipper and Adam. Plus I needed Bryce and Zion introduced early in the story. They play a role in future developments.
When I wrote Hail to the Chief, I listed out events over the intervening time span. I needed to figure out marriages, kids, careers, and locations. Knowing I planned spinoffs, I also had to figure out what events straddled different stories. Cristina vs Damien is a good example, we've read about it in two stories now and it'll be in another one next year. I also jotted down trips for CJ and Owen. Burning Man is in there at Owen's insistence due to the environmental emphasis.