Alright, thanks for your help. The chocolate may be a bit much. The only purpose of this would be to tell her she's a special person. But maybe that would be "too much too soon", even though we've been friends for a long time. I think I'll just go with the casual approach tomorrow (Monday, not Valentine's Day):

"Hey, that dance is coming up Friday this week. I was thinking about going and I just thought of you. I was just wondering, would you like to go?"

What does everyone think?