Drowning my sorrows in the boozer I noticed two girls dressed up in what looked like 1940s schmutter. One was costumed along the the lines of Rosie the Riveter, while the other had gone in a higher maintenance Rita Hayworth direction.
When I enquired, they told me that they had just been to the Chap Olympics, and that although the competitions in "Three-Trousered Limbo, Moustache Wrestling, Quill Throwing, Umbrella Jousting and Bounders" were finished the evening promised a "live swing band, several burlesque turns and a man impersonating a Spitfire."
Unfortunately the postprandial dip occasioned by refuelling at the Italian Kitchen (as well as a keen professional interest in strong continental lager) seemed to have impaired my sense of directions and I couldn't find it.
There is always next year I suppose.
Jim Shannon was there, and you can see his photos on http://www.flickr.com/photos/jimshannon/tags/thechapolympiad2009/.