One theatrical story I have come across is that if the audience is smaller than the cast, then the performance can be canceled - except at the Edinburgh Fringe, where an audience of two, one or none is common but The Show Must Go On.
Whatever the custom or individual production decision, the thirteen of us performed for an audience of two last night. Overall the play went well, although my own performance was uneven. It's our own fault, I suppose; we've all been telling friends to come in the second week when the show will have bedded in, and there are plenty of bookings for next week. Well, let's see what happens tonight.