Not for me, but for my girlfriend.
She has a Motobecane Messenger which is a single speed road bike. Just like her, I've never participated in any races, though, my first cyclocross race will be in a few weeks. Unfortunately, her bike wouldn't work well for cyclocross.
With that being said.. she's somewhat competitive and she was asking me the other day if their was some type of race or something she could participate in. Any suggestions?
If it helps, I'm located in Northern California.