1. Prepare lottery equipment: prepare a transparent container, such as a large glass jar or bag, so that participants can see all lottery numbers.
2. Formulate lottery numbers: Assign each participant a unique lottery number. You can use paper or plastic labels to write down the numbers and put them into the lottery equipment.
3. Random draw: draw lots by unrelated third parties (such as staff or school representatives).
4. Lottery process: The lottery personnel should publicly display the lottery equipment in front of all participants and deeply stir the numbers in it to ensure that each number has an equal chance to be drawn.
5. Publicize the results: the participants in the lottery are exchange results, and the exchange order can be determined according to the lottery number.