so i was at the local bar on tuesday, it was basicaly a highschool reunion (lame) i was talking to a girl i knew from school and she introduced me to her bf. then one of her friends who i'd never met before, asked megan (my highschool friend )to introduce her to me.i chated with this girl for about half an hour and we discovered we both love volenteering, she asked me to help with a volenteer thing she was doing i agreed to and got her number. as she was leaving she came up and said to make sure i call her, all good it seems.
i waited a couple of days, due to christmas, then called her up and asked her questions about the Vol work. we talked for a bit and i invited her to see some of my friends play at a local joint. she said she would try to make it out but seemed kinda disinterested. that night (last night) she didnt show.
my question is what do i do now, i've got her number but the only volentering option she mentioned was a month away........ so what now?

Wait a week, find out about the volunteering thing and talk to her about that. Also look at some posts on how to avoid "flaking".