Hi Laura, I've gone to Road to California a few times.
One year I was there for 3 days, including a morning class. For me, that was a little too much time! i walked around the quilts and vendors many times. But, a day wasn't really long enough either.
There is a huge number of vendors in the main room where the quilt exhibit is, and there is another large room next to it. Lots of sewing machine and quilting machine vendors, it was fun to try out all the machines when I was there for 3 days.
Sometimes people have a meet and greet at the Superior Threads booth, watch for that subject to pop up of the forum. TQS or The Quilt Life mag often have a booth, also.
It's a nice show!
Kathy