There is a bar upstairs. There is a dude who sits in a old school dentist chair who checks IDs to let you up there.
I will warn you, it gets pretty fucking packed up there. I spent the whole Nevermore show up there back in 2006 and not only was it packed but I was surrounded by drunken assholes trying to take my place. I'm sure if you're drunk it won't really matter too much but I don't drink at shows so.....OK, I'm rambling.
Yes, there is a bar upstairs at Studio Seven and it's always open.