Celebrate the 100th day of school by having each classroom show off a different project involving the number 100. Set up a rotation where different classes visit each others' classrooms. Classes can make displays of 100 items, for instance, or host an "exercise room" where visitors do 10 different exercises like jumping jacks or sit-ups 10 times for a total of 100. Other 100 day activities include learning 100 ways to say hello, or lining up 100 students.
Involve your whole school in celebrating Dr. Seuss. Classrooms of grades 4th, 5th and 6th grade can host lower grades by creating different Dr. Seuss related experiences in each classroom. One class can, with the help of the teacher, cook and serve green eggs and ham to the younger kids after reading Green Eggs and Ham. Another class can read The Shape of Me and Other Stuff and then help the younger kids trace silhouettes of objects and of themselves. Lastly, a class can read Bartholomew and the Oobleck and then help the younger kids make oobleck using cornstarch, water and food coloring.
Earth Day is a perfect opportunity to bring the whole school together to help the environment. Classes can be involved in a friendly competition by seeing what class can bring in the most cans and bottles to be recycled. The whole school can also be involved in planting class trees, or a school garden. Students can plant food they can enjoy like strawberries, cucumbers, lettuce and tomatoes. This activity will teach children how they can provide food for themselves, and eventually their families, while using less resources such as food transporters and food packaging.
A carnival will bring the whole school together by uniting all grades in creating a fun day for everyone. Classrooms can sponsor booths through which students will rotate. Different grade levels should choose a booth, decorate it and take turns running it. Students should also clean up their area once the carnival is over. Booth ideas include a bean bag toss, bowling with empty two-liter bottles, or a dart throwing booth where kids try to pop balloons pinned to a cork board.