Oh, how I love Glen Echo Park! If you're ever in the D.C. area and want an extra adventure, head on up to Glen Echo in Maryland. It's an amusement park and artists' colony, with these yurts in which there are pottery classes and calligraphy demonstrations. There's also this great glassworks gallery with lessons. I'm already envisioning the possibilities -- first, I'll take a glass bead making class, then one in silversmithing, then combine the two with crochet to make some really interesting jewelry :-)
The Dentzel Carousel there is really amazing as well. Here's some more information about it, and for only $1.25, you too can take a ride!