How do I get competing with Mountain bikers

How do I get competing with mountain bikers? Do I just find a local mountain bike race enrol and turn up with my KH24?

What sort of race does a unicycle have a decent chance at - downhill, flat, circuit - I am totally ignorant of what races are out there. And also what type of uni is best for the job 24, 29, guni?

This recent thread has a lot of good tips: Riding in a non-uni race

Thanks - didn’t see it.