Xess Dx
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Embers is the granddaddy/lady of the gay bar scene in Portland. It may or may not be politically correct, but when I was in high school, the City was where the kids went and Embers was for the 21+ crowd. Everyone knew the gay bars had the best music, and so that's where we went, gay/straight, didn't matter if you liked to dance.
I recently went to Embers for "afters" with some friends, and it's a good spot to hit up. Really it's two different venues in one: a back area bar/dance floor/nightclub, and a front area bar/cabaret stage.
Both have good things going for them. Drinks are reasonably priced and well poured. Rarely had to fight for a space at the bar to order or wait for a drink, even if busy.
The back dance space is solid, and the music good. As for the front bar, I've only been there when they've had a drag show and it's a hell of a lot of fun. Hard not to have a good time at a drag show.
Because it's closest of the Old Town entertainment area to the Park Blocks, and easier place to find close by parking than most.
Definitely on the list if you're doing an Old Town pub crawl.