How do you ask a girl to meet up in a non romantic way?

Might sound like a weird question but I'm not a hugely social person :L basically at my end of school prom last night I spoke with a really nice girl who I had never really talked to before. When I got home and checked Facebook she said that the chat was lovely and I seemed awesome, and hopefully we could meet up or something sometime. Since I'm no good with this stuff I was wondering how long I should wait before I ask, I don't want to seem clingy or weird. And how would I put "do you want to meet up sometime" in a way that doesn't sound like I'm trying to ask her out? Thanks in advance :)