The Keystone Division of the NMRA's Mid-Central Region is holding its annual Model Railroad Jamboree on Saturday, April 23. This all day set of clinics (and more) is easily one of the best values in model railroading today. For $35 ($25 if you belong to the NMRA) they give you an all-day set of high quality clinics and feed you breakfast and lunch. There are clinics, contests, operating layouts, raffles, and a whole lot more. I've been been attending for nearly 10 years, and it's worth the cost and the drive (200 miles for me).
Much more info at: http://www.keystonedivision.org/jamboree.html
Regardless of what scale you run, there is a lot of information there.
See you there,
George