There used to be one at the Malt Loaf in Conwy on Monday nights...Open mic/session mix I believe. They, also have professionals the other nights of the week. Check w/t the club. I was on a cycling tour and was fortunate enough to have my mandolin w/me. They let me do 2 songs and I borrowed someone's guitar for the 2nd(I hadn't been playing mando for very long and only knew one song on it). Then I was offered a ride back to my hostel by a brilliant musicican named Alexander. Played accordian and flute. North Wales has some of the best local...and I mean 'world class good' musicians of anywhere I've been in my travels. There was one at a place in Bangor called the Tap and Spile on Tuesdays, but it may have moved as the place was purchased by different owners.