A bit late posting this, as 'Open Microphone Night' was actually on the 23rd September in my local the Fox and Crown. It wasn't really a roaring success, as Andy the landlord hadn't really advertised it well so not many played, erm you could count them on one hand in fact!
Each person got to play 3 songs of their choice, only with a few turning up to play they got to play much more!
Here's a photo of my old man playing!