Gifting peers at a Fair

Buckle up for a strange question…I have a table at a local author expo that will feature 100 authors, and I want to befriend many, leave a positive impression on all. The power of reciprocity suggests I gift them with something, from help setting up their tables to a copy of my book. I also worry about getting underfoot. (Yes, it’s my first fair as a participant.)

I am eager to do all that, but I wonder what might be a nice token for all. Any ideas?

I am considering candy and a bookmark, given with a smile and a handshake, but that feels lame.