In New Zealand some of the big festivals have a late night 'home brew' session where home-made beer is available free to everyone there and the singing is unaccompanied, often shanties, but usually chorus type songs and the thing goes on until the beer runs out - usually in the wee small hours.
Our festivals are mainly camping ones these days and music happens all over the site, ranging from trad, bluegrass, blues, morris, NZ, singer songwriter, children's sessions, a ceilidh and invited 'big name' guests from all over the world.
They happen on long weekend/public holidays so people can drive home on Monday. The next one is in Wellington at the end of October, there are others around New Year but the biggest is in Auckland at the end of January if y'all wanna come. We had a group of catters there this year as part of the Shellbacks!
Robyn