The Lumsden Freehouse in Newmarket is the usual home of Laugh Lines Comedy on the first Monday of the month.  This is a free show.
The normal format seems to be a guest Pro host MC and a mixture of pros semi pros and open spots (relative rookies).
There is a good rotation of comics so each month is a new show. 
The quality of comics is normally pretty good though the open spots can sometimes be hit and miss I have yet to see any major flops.