24 Hour Race - Faster Mustache

MA3K Sounds dope but I think the police would jump right on it after the first few hundred reports of number-adorned cyclists racing full out around the city of London.
This would be much larger than your run of the mill Friday night alleycat.

1. Steer clear of the Parliament Exclusion Zone - The police would no doubt use anti-terrorism legislation to halt any race - they would argue that a race was a 'protest' of some kind.