Re: AUDIENCE REN was definitely there to support his husband. He sat near the front and intently watched the whole time, and probably brought Eliot a bouquet of flowers for after.
BUFFY also came cause she did stuff with Tina and Eliot before, and also got to support her mythological relatives, and all that.
PENNY might have come? If encouraged to do so. We can say Ren strongly suggested he did unless Alice said she was going then Penny might have grumbled something about musicals, and come anyway ;)