The first thing you need to know is that cannabis clubs are non-profit organizations, where marijuana is grown on the funds of membership fees, and then used strictly within the circle of club members. I personally am a member of https://cannabisbcn.com/ and I love it. If you want to become a member, you need to get an invitation from an existing member of the association, or you can be invited by the club itself. This means that simply coming from the street without an invitation will not succeed, you will be refused.