Unless I am wrong, it looks like Leonard Starr will be at 2009 San Diego Comic Con according to program schedule.
MGP
http://www.comic-con.org/cci/cci09_prog_sat.php
Saturday, July 25
4:00-5:00 Spotlight on Leonard Starr— Batton Lash and Joe Jusko (and perhaps a mystery guest or two) interview Comic-Con special guest Leonard Starr (Mary Perkins On Stage, Annie, Kelly Green, Thundercats, and Golden/Silver Age comics artist) about his career spanning over 50 years in comic books, comic strips, and television. This Starr-filled panel promises to be both insightful and engaging. Room 2