What town are you in?
I don't know what you have planned but I doubt you will get much help - we've asked before for several clients.
My friend proposed during Return to Forbidden Planet, on stage! Stopped the show when the audience knew what was happening... took some time for them to realise because he was actually starring in it and he was proposing to Miranda! Boy what a roasting he got: she said yes though!
Someone I know took his girlfriend round to the stage door of one West End show with the pretence of getting an autograph, grabbed a star coming out, quickly gave them a note, asking them to ask her for him and bob's your uncle!
Don't know if he had a plan b...
If all the world's a stage, make life a theatre break