Coincidentally enough, I met the former owner of the Nar Bar a couple weekends ago when I was hosting the Mickey's open mike. He was kind of trashed, but nice; I don't remember his name, because I have some kind of psychological block regarding names - I can barely remember my own.
The physical space itself was taken over by A Room of One's Own, which used to be half the size it is now; they just bashed in the wall between the two storefronts and expanded into the old space.
It was a number of other entertainment venues both before and after its Nar Bar incarnation.
Apparently they used to have a Grateful Dead bootleg night - which, for obvious reasons, I never attended. The only show I can say for sure I went to there was Grant Hart and the Nova Mob, who I saw there in the winter of '89.