I'll level with you. It's probably going to rain this weekend, which, yes, could take some of the fun out of a beer festival (I know you like to walk around shirtless on the waterfront until you're sunburned and dehydrated, but you're going to have to wait a few months). But if you're going to be stuck inside, you may as well be on the the production side of the Cascade Barrel House. Cascade Brewing is throwing a Saison festival—the first of its kind in these parts—and for enthusiasts of this varietal, I think it's not to be missed. They'll be featuring beers from, among others, Upright, Block 15, Boulevard, Breakside, Brasserie Dupont, Cascade, Double Mountain, Green Dragon, Oakshire, and Stillwater.
The festival runs from noon to 10pm, and admission is free. Beer costs $1 for a 4-oz taste, or $4 for a 14 oz mug (I'm not really a math guy, but I guess it's more economical to get your beer in small doses). Kids are allowed, but certainly not encouraged.