It would be a drag cabaret show. I even have a potential host.
The two drag queens would play sisters - the Idas of Marchmont. They're two snooty Roman Catholic 'women' with a murderous streak and penchant for musicals.
Think every evil-character's theme from every musical: Mrs Lovett having a little priest, Cruella de Vil, Lucy Harris bringing on the men. Then add in the madness of Brideshead - arch plots to control the men in the audience, fey sons, messed up daughters, absent husbands... it would all be madness.
I've even managed to get a hostess for the night: Cruella de Rohan.