Or, else, mark this day in your diaries to avoid any central London pubs. For, on 9 October 2010, a sizeable band of peregrinating drinkers will attempt to beat the world record for the biggest pub crawl. To wit:
Our aim is to organise 3,500 people, split into 35 groups of 100 (friends will be kept together), to start in synchronicity at 11:00 in 35 different pubs around central London. Every 45 minutes they will rotate in an orderly manner to the next pub until, after 8 hours, ten pubs have been visited. This will satisfy the requirements of the Guinness World Records.
Thanks to @LostMyHeart for the tip-off.