Surprised I haven't seen any moaning about this yet... http://www.london-oktoberfest.co.uk/tickets_finsbury.html
"The organisers behind the Canary Wharf Oktoberfest are putting on a spectacular event at north London's Finsbury Park, welcoming over 3,000 guests."
All the beer, bratwurst and oompah bands you could dream of.
18-31st October, though it's only open Thu-Sun, and for Halloween.
Watch out for drunk lads in lederhosen!