At Tech City Bowl in Kirkland http://www.techcitybowl.com/directory.html
on Friday, Saturday and Sunday nights, they dim the lights, get the disco ball spinning, crank up the tunes and provide glow-in-the-dark bowling balls. Toss in a couple of good friends, order some drinks from the cocktail waitress, and you've got a ready-made party!
The only drawback is that it gets pretty crowded, which makes getting above-mentioned drinks a little slow, and there might be a wait to get a lane. I'm fairly certain they will take reservations if you call ahead.
Totally fun way to spend an evening!