Since my character is not really faction-tied, I don't hang out a lot in faction-venues, and not at all in faction-only-venues. But when I do, I like how each has a certain feel, the cultures of the factions tend to be somewhat palpable.
The location of the venue is also a factor in how likely I am to visit it, as I travel to it's location ingame, thus if a venue is far away, I won't visit it often or at all.
I also like me some eye-candy, so please, do post links to pictures in the venues' description!
And yeah, events will make it more likely for me to visit them, especially if it's a venue I have not visited before. Most times, I visit a particular venue because of the regulars I expect to see there, and the same is also true for events, I'm more likely to show up if my character's acquaintances or friends have indicated they will visit the event.
When it was still operated, I thought The Bunny Lounge was nice. "Never a dull time" was the phrase, and it was mostly true, although sometimes excessively so. The sleeper mainframe gave it a spooky feel. Also, because Syn invited any character in Jita that might/could be a roleplayer, it was a nice place to see new faces. I also liked the movie nights. And Ché had his own room there, which Silas called "Horrid", with a smile.