Give some feedback.
First speech out of the way, its time to give some feedback to the other participants. You should watch as many of the other speeches as possible and give feedback on a minimum of two. You should comment on the following:
Did the introduction capture you attention? Was the body well structured? Did they finish on a high? Did the speech flow naturally?
Was the speech interesting, what techniques did the speaker use to capture and maintain attention? Were they successful? How could they improve?
How did they sound? Were they too fast, or slow? Were they clear? Did they look comfortable? Did they do anything annoying or odd (like play with hair or have hands in pockets (gents!!))
Be honest say what you feel, don't be shy, but be constructive and offer advice.