It looks like your past the Approach and Mid Game stage, and your set for 1st date but dont know how to go about it!?
Assuming you have some rapport with her ... Just call her up and ask something like " Hey I scored two tickets for a concert and my friend flaked on me at the last minute (make sure you mention friend so she knows that you didnt get the tickets for her thinking its a date of some kind) ... Would you be intrested in tagging along??? ... I promise it'll be one of the best nights of your life!" (or whatever line works for you)
Thats all you need to do rite now ... and I suggest you forget your oneitis at this point ... its gonna pressure you to do things you'll regret later on!
Hope this helps ... Cheers!
