These days its impossible to get a personalized experience with celebrities unless you use websites like Cameo.com to fill that convention void.
Fanmio.com, one of the latest fan experience sites, has had a host of pop culture icons from Tim Curry to boxing great Floyd Mayweather. On August 29th. the site features Christopher Lloyd who has played such epic roles like Doc Brown, Uncle Fester, or Jim from Taxi to name a few. Experiences start from just $30.00!
Check out the info here