As you might guess, there's not a whole lot happening eventwise over the holiday weekend. If you're going out to catch a pint, however, you really can't go wrong. Nearly every pub worth its salt has busted out special beer, and a glance through the taplists of the pubs in the right column will make your mouth water. (Though what's up with the Horse Brass website?--it's been down for weeks now.) Oh, and if you're hankering for an IPA, Deschutes Portland is currently pouring five.
If I get around to it, I'll put up reviews of Sierra Nevada's Kellerweis and Full Sail's LTD 03--two beers that would serve you very nicely in your effort to chill on these 90-degree days. (But no promises.)