American Mathematics Competition (AMC) Form B contest, instead of the Form A contest. This year we held the contest during an assembly period and students only missed half of one class period. (In previous years students missed two class periods. However, I think it is important for students to be in class, because you can't replicate the learning that happens as students interact with each other.)
The contest lasts 75 minutes and consists of 25 multiple choice questions. Students cannot use a calculator and the questions are quite challenging. After the contest was over, the room was buzzing with chatter, such as "How did you solve question #8?" and "How many did you actually put down an answer for?" Tomorrow students can get their test books back from me and I look forward to discussing some of the problems with them.