Let me rephrase this question so that I don't sound "scared".
If you were getting married on Sat at 3, would you be concerned that your photographer is racing at 9? I'm signed up for a Sprint Tourney and pumped about it but people are telling me that as a "professional", I should maybe sit this one out in respect for my clients because if I crash and get injured, it could be a bad idea.
I figure match sprints isn't that big of a deal. A kieran or some other crowded race maybe I should think twice on a work day.
Being a self-employed photographer is different than being an office worker, unfortunately.