Final answer:
In 'Wonder,' the fifth graders at Beecher Prep go to a rural nature retreat every spring for three days, which serves as a significant event in the story.
Step-by-step explanation:
In the book Wonder, the fifth graders at Beecher Prep go on a three-day trip every spring to a nature retreat at a rural location where they can experience outdoor activities and bond as a class. This school tradition is an important event in the story, providing a setting for significant character development and interactions, particularly for the protagonist, Auggie Pullman. The nature retreat is a meaningful part of the students' final year at Beecher Prep before they transition to middle school.