I grew up with a father who collected and still collects toy trains. Seemingly every other week we would be going to Lancaster, York, Gilbertsville, Edison, Hamburg or Baltimore for a toy train show.
Wondering if collectors would have any interest in an event in the Central PA area. It could be something really simple to start out. Just rent out a cafeteria at a school or a bingohall for a Sunday morning/afternoon and find a place that already has tables. There are several retro stores in the area that might be interested in attending as well.