Nc for this as its very outing!
I am in an amdram group, have been for 12 years. We share our theatre with another resident group and lots of other groups use it on an adhoc basis.
We have done better when it's been something people know, fawlty towers, dads army, allo allo, darling buds of may, Frankenstein, flint street nativity, blackadder etc.
Pantomime always does well as it's cheap and good fun.
I remember one play (I wasnt in) there was an audience of 4.... eep but the show went on!
It's much harder to perform to a small or quiet audience as well and each night will be very different.
I have directed Ladies Night which was the original stage play of Full Monty, we had a stall at a market event in the city centre and so many people "didn't want to watch that kind of "thing" " even when explained it as a comedy just like the fully Monty they couldn't be convinced. Our audience was ok and we broke even but so disappointing for the guys who put so much effort in.
It's a shame not more people appreciate or try am dram, alot of time they think it will be like watching a school show (which can be painful). Dont get me wrong I have see some God awful acting or badly executed shows in my time but the majority tend to be very good.
Am dram is dying out in some parts but most of the time its lack of support, funding or people taking part. Also having backstage , so many people want to be on stage but dont want to stage manage, help with costumes prop or set. It always ends up being the same people and its draining.
I have always found that advertising is key. Getting it into local papers, website, leaflets, radio stations and even getting the town crier to shout about it.
Good luck OP, I hope you really enjoy it and dont forget you can be part of more than one group especially If you want to be involved all year round