I went to my first one last month a week after the earthquake and saw it here on HN. You should definitely come out for the next one which will probably show up here:

http://blog.makeleaps.com

It looks like the founders of MakeLeaps (po and jason_tko on HN) have been organizing them roughly every two months for about a year now. I was thinking of bugging them pretty soon to see when they were thinking of having the next meetup.