The Dunwich Dynamo is a 200 km night ride from London to the lost city of Dunwich on The Suffolk Coast.
From 1992 to 1998 it ran as commercial pay-to-enter event. In 1999 it became a free, traditional event; something like Christmas but with less eating and more travelling by bike. This Successful format has continued since 2000.
Setting a date for an informal 'turn-up-and-ride' event - on the Saturday night nearest a full moon in July - the route starts at London Fields at about 8/9pm, and travells through the night to Dunwich on The Suffolk Coast