I'll chime in with a Southern California viewpoint.

The only Games I'm aware of in the greater San Diego area are held in Vista. Link This is a smallish event but a lovely venue and, as I said, the only Games in town

In greater Los Angeles/Orange County metrosprawl, I'm aware of two:

Orange County has "ScotsFest" held at the fairgrounds in Costa Mesa. Link I've yet to attend these Games, as they fall on Memorial Day weekend. Their site mentions attendance of 16,000 -- 90 "Vendors, Organizations or Societies -- and "more than 60" clans.

The Queen Mary Scottish Festival doesn't have a very good Web presence, that I can find, but scroll to the bottom of this page for some 2009 info. I very much dislike this venue, and will not attend again. Clans are inside the ship, restricted to flat tables, and it ends up looking like a rather dowdy trade show.

Farther north are the Seaside Games in Ventura Link These are my second-favorite, after Vista, and there are lots of pictures from the venue posted in my recent thread.

If I've missed an event in the area, my apologies, as I said these are the ones I'm aware of. Hope this helps!