During an event or perhaps at a bar where it seems both of you are going to be around for a while:
"I'm not really big on pick up lines but you seem nice."
Then let the response and following conversation follow it's course and move away to another seat or whatever...then when she tires of all the other BS....she might come back over to you.
At least you have not been phony or pretentious...and distance can be a powerful tool if she is the least bit attracted to you.