Here is a schedule in case you plan to visit Philadelphia..
I didn't find any bookplates today but I rarely go home empty handed.
.I got these Maltese Cross buttons last year at an indoor flea market.
Here a a few of the items I found.today
I also purchased 25 different advertising slide rules from the late 1940's through the1970's.
I'll put them away in a box until I figure out what to do with them.