Heres a fun and effective one i made up while sloppy at the local watering hole:

If you ever find yourself waiting to order a drink next to someone you'd like to know better throw this at em.

Avoid coming off creepy and confidently ask "You don't remember me do you"
after she says no, reply something like "well i'm not going to lie to you i'm a bit insulted..."
she asks why
this is when you spin a little story about how one night a while ago you two had quite the blacked out adventure here and you were sure she woulden't forget it.

after this little interaction you can tell exactly how your chances are with this one and the transition to mid game usually happens naturally

any critiques/ advice/ ammendments are apprciated

I think she is going to be sure that it's not true.

Maybe you can say that it may have been a nightmare.

thats part of the fun, its a risk that she doesnt go there often but the reward side is if its obviously made up and she still goes along with it- huge IOI