Hey Lionel!
California Extreme 2011 takes place on July 9-10 this year. I would say its a better show, if your into solid-state machines. I think you get better bang for your buck than Pacific Pinball Expo, since they also have half the showfloor full of classic arcade games. Everything is on free play, except for some of the Stern's outside the showfloor.
Pacific Pinball Expo 2011 takes place September 23-25 this year. I would highly recommend it, if you are especially into EM's. They have a who's who of EM's. They are starting to listen to show-goers and put in more solid-state machines though. The number of solid-state machines increased substationally compared to 2009.
I will be attending both as usual. Probably run into Johnnyo again.
The other thing I can think of, is check out the Pacific Pinball Musuem if you show up any other time. Playland at the Beach is another great place to visit.