Choose a charity organization that you want your class to support.
Set apart a Saturday and organize a charity sale. Divide and assign tasks to groups of children.
One group could make posters and banners. Another group can write out invitations to parents and well-wishers. Another set can discuss and plan the items that should be brought to the sale. Stud-ents can contribute cakes, cookies, candy, craft items and knickknacks to sell.
When the sale is over, go with your students to the charity you are supporting and hand over the fruits of your effort!