Innumerable folk clubs have both "Singers Nights" and "Guest Nights"; all the folk clubs I've been to have managed to cram in a lot of floorspots even on their "Guest Nights".

It might be anything totally amature open stage to a pro guest with pre-booked support but the unifying factor is the intention to perform to an audience. That is totally different to a singaround.

Both have their place and have different priorities and objectives.