Check out the Celtic Bayou for a great happy hour and a good crowd of people. Located in Redmond, the CB was started by a few ex-Microsoft employees. Don't let this taint your impression though. Far from being a bland, corporate bar the CB has a lively, easy-going atmosphere. There's a nice bar area, booths if you want to grab some eats with friends, and an outdoor section to enjoy any good weather.
If the initial thought of combining Cajun and Irish cuisine doesn't sound that great, please reconsider. The CB has some good eats to fill you up as you put back a few pints. A few of those pints may even be the local brews the CB loves to serve up. Speaking of which, you'll notice the regulars of the bar by the personal beer mugs the CB keeps for them.
If you're looking to check out a new bar or happy hour in the Redmond area give the CB a shot.