in fact, i do remember biting nails before coachella last year. first wilco dropped out. then thom yorke cancelled the australia shows just before coachella due to strained vocal cords. i was pretty nervous, yes, because i had already paid for plane tix. ditto for lollapalooza although there isn't quite so much invested yet. at least my hotel room isn't paid in full.
anyway, coachella's lineup is announced in early to mid-february for a late april show (2 1/2 to 3 months in advance by my count). beyond a couple of minor dropouts and/or additions, the coachella lineup is usually pretty much the same when the event comes around. lollapalooza's announcements have been sketchy to say the least and the number of promised acts has dropped by 10 since i bought my "souvenir" ticket. yes, i'm nervous.