This is my first post... so, hi. 
There's a girl that I randomly added on Facebook about a year ago. Recently she's started tweeting a lot too, and I'm starting to really like her. She likes the same sort of music as me, quotes movies I really like and seems to not like being single (she's said a few times on twitter that she loves the getting to know someone stage of the relationship).
Anyway, we're both going to Download Festival, so I invited her to camp with my group of friends (there's about 30 of us, and she's taking a couple of friends with her too, a lot of people don't know each other in my camp - it's a public thing). She RSVP'd the Facebook event and she says every now and then that she's looking forward to it.
My problem is that I can't seem to get a proper conversation going with her? Like, I've messaged her my number under the pretext of using it to meet up at Download, but she never replied to the personal message, and only seems to talk to me on the public domain.
I was wondering what I could say to her to get her to latch onto that "getting to know each other" stage that she seems to be into?
Thanks in advance