My friend Dave and I once went to see Dr. John at Wolverhampton Civic Hall in the UK. We only saw it advertised a few days before the gig so we were amazed to get tickets.
Anyway, the layout for the gig was cabaret style with large round tables taking up all the floor space. It as a bit quiet around the tables with only 4 or 5 people sat at each one, even though each table sat 12.
I commented to Dave that there must be loads of people sat upstairs in the circle which we couldn't see from where we were sat near the back.
Anyway, it was a fantastic gig. They gave it absolutely everything. Dr John's bassist for that show, who I never learned the name of, was my inspiration to start playing.
Towards the end of the gig everyone sat at the tables stood up and wandered to the front by the stage. When we turned to look up toward the circle there wasn't a single person sat up there!
So Dr John was playing to only about 50 people and still played like it was a full house! That's the attitude I take to every gig. Well, if it's good enough for Dr John...
Anyway, back to the OP. My band has played to small numbers of people but we still give it everything. Our best gig since we got a new singer was playing out doors at some village fete thing. Our audience was made up of people queuing at the beer tent. Very RnR!