I found this calendar of beer events in Britain. I’m especially curious about the Bricklayers Arms in Putney. They describe themselves on their website as a year-round beer festival. That could be very dangerous! They are also a good ten minute walk from the nearest Tube or rail station. Need to scout the route sober.
From the London Independent – a list of 50 great beers, just in case suggestions are needed as a starting point. Then again, if you can lay your hands on a few of these, you can have your own home-based festival and not worry about sleeping it off in some back alley or missing the last train back to familiar territory.