It could be a lot better. There is a bug which doesn't let you gain any stars in popularity, or it does but only for the first few days and then shits out. I will be on the last thing on the page and not have any stars filled in. I think it would also be better with different things that could happen when you play a gig, like "The place was packed and they loved your band, +bonus money" ,"The place barely had anyone there, so you only got paid half." , "You got the night where you're supposed to go wrong. It's in two days." or even more interesting stuff like "Joey met a fan backstage who has cancer and signed their autograph PR goes up" , "The band got food poisoning on their way to the show" or "Harry was late because his girlfriend wouldn't stop nagging him". There are so many options you could put. Maybe you could have more pages of gigs, and put the time frame for like 100 or 200 days so that it's not as boring to try and complete. Another error is the days will say NaN if you load it.
All in all, I think this game has a lot of potential, but I like the concept you came up with. Keep working at it.