the only sn meets I have ever heard about were at mustang week. I have tried to get some people together to go to the NMRA nationals at bowling green in Oct but never got anyone.
If you're willing to drive or trailer it up north a little, the NorCal Shelby Club has lots of events including meetups, Coffee & Cars, Track events, etc. Our events attract lots of people from SoCal and are worth the effort to get to. Check out their website at norcal-saac.org. Our MiniNats events are EPIC!