<human>: Can you give me the gist of the text in a nutshell?

Asked a girl out and it turns out she's already going to the same event with her friends (approximately 5 other girls).

As a bit of background, I know three of these girls pretty wel. They used to live with my best friend in his freshman year of college, so we used to go out together a lot; but I don't know them well enough to have ever met up with them without this friend being present. The other girls, including the one I've asked out (first date) I've barely spoken to.

So when I asked her out she said I was welcome to come along with her and her house, or gave me another date to reschedule. 

Would this be a bit awkward for a first date? Is she only asking if I want to come along to be polite and would me actually accepting the offer be an intrusion on their house evening out?
<bot>: first "date" (if you can call it that) with a girl with all her friends present or reschedule?