Flirting at a con is no different than at the club or party, imo.
It's just something you gotta try out, cos if you meet someone really awesome, it might be your only shot XD
But then again, I'm not the kind to make the first move. So idk. Plus it's a con, so everyone goes a little extra crazy. So you know, just go for it! But don't be over-the-top obvious or assertive, that can get awkward/creepy/weird fast >___>;;