Timonium, MD

This is a recurring event and worth the visit if you're in the area.

The Great Scale Model Train Show and Railroad Marketplace
http://www.gsmts.com/
Next Timonium Show -- February 4-5, 2012
at the Maryland State Fairgrounds in Timonium, MD

Saturday 9 am - 4 pm
Admission $9, under 15 free, Family $18 Good for both days!
Sunday 10 am - 4 pm
Admission $8, under 15 free, Family only $15

I've attended several of these gatherings and they are a lot of fun. Here are some pix I took at one last year:
http://mentilucent.net/TimoniumApril2011/Timonium.html

Hope to see some of y'all there!