I have so many options to how I should ask her this chick out

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I have so many options to how I should ask her this chick out but I wonder which one's the best and how I go about to doing it.

I knew a certain girl back in high school but I never talked to her at all. I think we had a class or two together, and we acknowledged each other but never talked. I used to have a small crush on her though and added each other of Facebook a while back.

Well, 3 days ago or Friday, I seen this girl again at an event, full of teens and dudes in their early 20s, lots of drinking. I didn't know any people at the party but like 3 people I met somewhere else and they're cool. When I ran into her we sorta reintroduce ourselves and I told her I didn't know a single person around. We proceeded to move into a quieter room with not so many people around. We had a long conversation about anything from the party to our lives, she introduced me to other people, it was a blast. Really felt like we were hitting it off. She likes to smoke pot too (legal state).

When I was getting ready to go home, I asked her if she wanted to smoke pot together, she said she had a curfew and will be leaving soon too but she would've seriously loved to though. She tells me she's really glad I came to the event. Hugged and left. Fairly certain she's single but idk. There's also some other big local event coming to our city coming soon. Should I ask her if she want to go there with me or try to hit her up again at another party soon?