The key is in the name speed dating..

You need to speak as quickly as possible. The quicker you speak the more you cover the more impressed she will be with your efficiency. Cover as many topics as you can in the time you have and when you have a question try and limit her to one word replies so you can cover more ground.

Dont worry about running out of things to or saying the wrong thing. Simply look around the room and ask her opinon on everything you can see in your field of vision.

When Its time to move on do so by sprinting as quickly as you can to the next girl. This will show her your really into her so much so you are unable to control the urge to run headlong into her, screaming and waving your arms in the air also adds to the effect if suitably mastered.

Rember if your unsure, open amphetamine use is very much encouraged at these events. (just dont forget to offer some to that lucky lady your talking to )

Good Luck!
& please dont take above seriously.