Each time you give a prepared speech, you receive a 2 to 3 minute oral evaluation from a preassigned evaluator. A good evaluator will say "here's what you did well, here's why doing that was good, here are some things you might want to work on for your next speech, and here's how you might work on them."
Not only does the speaker receive very useful feedback, but being an evaluator gives you the opportunity to improve your own ability to practice critical judgment and to give constructive feedback along with positive reinforcement, encouragement, and motivation for others.