Best day to watch SM at Amago?

When would be a good day to make a spectating trip out there for a weekend excursion. I live in LA and I just got back from the Grange race and I thought It would be cool to take a weekend trip out to AMAGO and watch a track day. Just to see the guys and different bikes running and maybe ask some questions. I just wanted to know when a good day would be to see the most amount of guys or girls running? Are there certain days where there are only SMs on the track. Please advise. Also how far is the track from San Diego?