Have your questions ready
It is supposed to be a conversation. A dialogue involves two persons talking to each other. It is not an interrogation session so do not expect to be asked questions non-stop. Get ready to ask your own questions. This will prove that you are not indifferent to the person and that you wish to get to know someone.

Enjoy speed dating!
Have fun with the event. If it is well-organized, then you will remember it for a very long time. Speed dating will help you get to know people and you will also find out more about your own character. You will also learn to react without too much thinking, which is another benefit. Enjoy your time getting to know people.