I'm sorry I didn't post this earlier but I found this information on the Seattle Times website. The Seattle International Film Festival had a screening of "Back to the Future" and Lea Thompson was there. That would have been really cool to meet her.

http://www.siff.net/cinema/detail.aspx?FID=261&id=45076

BTW, read what it says at the bottom about why Christopher Lloyd canceled his appearances. Hilarious!