Help! a non-date advice, but i know theres a high change of embarrasing rejection, plz help!?

Ask her. You never know, she could find something like that really interesting. At the end of the day, it's a night she doesn't have to spend alone or indoors so that would work in your favour. If she says no then it's no harm done, just say something like, "oh okay, cool, no worries then". If she says yes then get her number and meet her before the show so she doesn't feel weird walking in by herself.