I live about 15 min from Blue Diamond, not so sure about there being a supermoto track that can be ridden daily.
While I was racing my gf talked to somebody from Blue Diamond and they said there was a supermoto track. Not sure if he was officially from Blue Diamond or if he was some joker talkin crap. I was going to join either way, so I'll ask when I call. Itd be nice to have a place to run around on the sumo off the streets.
I am a BD member, and to the best of my understanding there is not a SM track that can be ridden outside of this event. I joined because I work about 15 minutes from the track, so it's a convenient way for me to get some more seat time. I'm far from a MX guy, but it's always nice to ride and the track has certainly taught me some things.