A "school carnival" refers to an event organized by a school where there are games, rides, and other fun activities for students and their families to enjoy. It's like a big party at school with lots of entertainment and excitement. Full definition
Like work at school carnival booths on their own birthdays. (rookiemoms.com)
For example, information on an upcoming field trip that includes a list of what... MORE your child is to bring or an upcoming school carnival flyer. (thespruce.com)
The watermelon stand at my kids» elementary school carnival! (thelunchtray.com)