We just finished our unit about heroes. As a culminating project each student chose a hero we had not studied as a class, learned about them, and gave an oral presentation. It is always fun since some students dress in costume and bring props. We work as a class to complete a brief chart about each person, but I always end the oral presentations wondering how much each student recalled from their classmates' talks.
This year after all the presentations I paired students so they could work together to create a project showing what they had learned about their partner's hero.