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As usual, your work with type is strong and noticeable. I do think this work stands nicely as is.
However, if you were to re-visit the poster I would look for more ways to tie in with the background wallpaper. The slight occlusion from the guitar is all we have right now.
The tickets, pulled the wallpaper in rather well by including some type over it and by "finishing" the half guitar with the left border. Everything feels necessary for balance.
BTW, I like the orthogonal type placement on the tickets too. It's nice to remember possibilities of a format that fits nicely in your hands.

I see what you're saying; the ticket was an afterthought, and wasn't actually necessary for the event, but it seems to be more popular than the poster. Maybe I should incorporate the negative type onto the background. Thanks!