The local brewery offers beer tasting classes. We'd been to one a couple of years ago, and it was fun to join people from the school for another evening. The brewmaster takes the course very seriously, giving us the history of brewing both globally and in Trondheim, teaching us the basics of beer tasting, and filling us with facts and concepts about beer production, serving tips, eating tips, and so on. The course is only 100 kr., and includes enough beer to cover the entrance ticket. Highly recommended!