Don't know why I haven't posted this here sooner, but just thought I'd share a great California show that I've attended many times.
The Hollywood Collector's Show is held in Burbank, CA at the Burbank Airport Marriott Hotel and Convention Center. It is located a few miles from Universal Studios Hollywood.
http://www.hollywoodcollectorshow.com/
The show is held four times a year (February, April, July, October).
It's a great show for in-person celebrity autographs and other celebrity memorabilia such as posters and lobby cards, however they are not a great show for non-sport cards.
There are usually 75-100 celebrities in attendance. Admission is $20. Parking is $7 when you mention you attended the show. All celebrities are required to charge for their autographs. I've paid as little as $10 (Kevin McCarthy and Dick Jones) and as much as $40 (Adam West).
The next show is October 4th and 5th.
Here are some of the scheduled celebrity signers:
Linda Evans
Erika Eleniak
Donna Mills
Roger Corman
Corey Haim
Shirley Jones
Eric Roberts
Barry Bostwick
Micky Dolenz
June Foray
Tommy Kirk
Heather Langenkamp
June Lockhart
Jamie Luner
Dick Miller
Bill Mumy
Noel Neill
Jane Russell
Here's a sampling of a few of my autographs I've picked up at the show.

Angie Dickinson, Robert Culp, Julie McCullough (from Big Bad Mama 2)

Pee Wee Herman

Mickey Rooney

Richard Dreyfuss

Henry Winkler, Tom Bosley, Erin Moran

Ken Osmond, Frank Bank

Debbie Reynolds

Ernest Borgnine

Tony Curtis