Isnt it one of those that is not paid?
i might just misread but when clients ask a theathre or a festival they just want company and not sex? they willing to pay your ticket or hotel etc but take it as fun and no mention about fee?
one of my friend went to jackson thriller last year with a nice client and she had a good time!

taxi ticket food were paid by client of course but no other fee. client was not pushy there was no expectation of sex it was discussed beforehand. both had a very good time. so its possible if u r clear what r the boundaries.
i would say if u like the type of music and wanna have a mini holiday just go
