We volunteeered for a state high school robotics competition. The high schools build robots that must compete in tasks for points. The winners go on to regionals and then the nationals. One of our high schools is now going on to the nationals.
It was an all day task. I was the head referee. It is a great experience for students to design and build. They also get judged on their teamwork and sportsmanship. They also provide a journal of their project to judges.