Re chorus singing: I think this varies from area to area. Where I live for several years underwent a longish period without sustained organised folk singing activities (Flourishing folk clubs) and so the practice of joining in almost died out.

One way we are overcoming this with our free concerts is while our group are not performing we're at the back of the room joining in the choruses lustily, and over a period of years this is gradually working. BTW the audience for these concerts is a strong mixture of passing visitors, general public and people in the local folk scene.

Whilst the concerts are held in a maritime museum and are maritime themed I'd say the proportions of performers are about 40% female, 60% male. We don't have any in-betweens or trans yet as far as I know but they would always be welcome.