Before I retired I was a member of our local 'Top Dog' group. Very relaxed and informal. No registration fee but £7 each time (I think) with a bacon sarnie and hot drinks included.
Got a couple of jobs out of it. Went more for the laugh than anything else - some of them were so far up their own a***s they could see out of their mouths

Lot of good sorts as well - just hardworking types trying to do the best they could.
Well worth it - not for new jobs but helped get my name 'out there' - more people who know who you are the better.