Not just any old cycling event, The Tweed Run 2011 is all about vintage.
The third annual run takes place in London on Saturday 9th April 2011, although you'll need to register from noon on Saturday 26th February as places are limited (last year, all 400 spots were booked in 45 minutes).
Once in, you'll need your best cycling-friendly vintage clothing (capes, plus fours, tweed suits etc), with prizes for nest dressed man and woman. You'll also need a vintage-style bike, with prizes awards for those too, not to mention a prize for best moustache. See the website for more details.