I run a singaround once a month in the Lion in Moorfields, close to the station. It's on the 2nd Thursday of the month from around 8.00 p.m., free and extremely informal ~ we just go around the room (which isn't very big). I chose that day to avoid any clashes with the Woody Guthrie FC, which is on the final Thursday of each month.

I list some other events on my blog: ReARM.