nah, just take her to it by yourself, you can do it!
Well I'm already going with a group of friends. I just figured I might extend the invite to her as well. She is a Marvel fan, after all.
Then be ready, willing and able to accept one of your friends mowing your lawn.
Not sure why the drama; ask her to get a drink after work. Pick a game, a TV show or something and when you get there make it the start of a conversation. "Hey, did you watch that last episode of Sons of Anarchy? What's with the crow?" or something. If it's gonna happen, it's gonna happen. If she's really as into you as you say (and I have no reason to doubt you) she'll overlook any nervousness or cobwebs.
Hell, the first date with my fiancé, I was waiting for her and she had changed her hair color without me knowing so was like 90 times hotter than I thought, so I was taken off my game bad. I was as nervous as I have ever been on a date. We sat down at the restaurant and I went with something dumb about Vince Neil or something, and we ended up sitting at the table for FOUR HOURS without even so much as ordering a drink. (I tipped the waitress $20 anyway, and as we were walking out, the owner came running out to ask what was wrong; I had recovered my wits enough to say "nothing wrong at all; first date with a beautiful woman and ordering food was the last thing on my mind". We've been together ever since, almost two years).
Just be yourself. Don't deny your nerves or pretend they don't exist, but don't be slave to them either. Go with your strengths: yourself.