Orange Empire Dog Club has handling classes at their clubhouse in Bloomington one night per week, you might want to check them out.
There used to be a handling class at Hunt Park in Riverside one night per week. The last I knew it was Thursday at 7:00 pm, but it's been a long time since I've been there, I don't know what's happening there currently..might be worth checking out.
Check the "club" section of the Jack Bradshaw website, it provides lot of information about stuff like this. Scroll down to get to training classes