When I were a lad, this would have been called a 'Blues Party' Malc.
There were loads happening in Sheffield and I imagine still are. Normally held in a Basement, or similar.
It's funny you mentioned this because I was only thinking yesterday that the origins of the Soul 'allnighter' in the UK probably lie in the 'Blues Party'.
These would have been going on pretty much every night of the week somewhere in Sheffield, Birmingham, Manchester, London etc.,,, and even Leeds!
Sean