Hundreds of colorfully dressed riders on often misshapen and mutant bicycles kicked off the 13th annual Dead Baby Downhill Race at El Chupacabra on Phinney Ridge Friday evening.

Friday’s race, which finished in Ballard, is part of a weekend of events celebrating mutant bicycle culture.

There was tall bike jousting, bands, bike dance perfromances and other activities at “the greatest party known to mankind,” which was held last night at the Bit Saloon and The Station along Leary.

Not to be confused with the Critical Mass, of course.