Advice on Meet Up with this girl

I've been trying to get a meet up with this girl, but she doesn't show. We've been in salsa dance class for a few months. One night at a dance, we hit it off well. Connected with her on Facebook and we message each other about once a week with some good rapport. When I go for the meetup, my statements go like this:
"Salsa congress on Saturday night. Maybe I'll see you and we'll dance until our feet fall off." Or
"Kizomba class on Wednesday. Maybe I'll see you there and we can get pizza at Chuck E. Cheese next door."

Usually I get an LOL with some questions. But never a meet up. What am I doing wrong?