One morning, the Peanuts gang learns that their beloved camp is shutting down because there are fewer campers joining each summer. The news especially saddens Charlie Brown, who feels hopeless about losing a place that has meant so much to him and his friends. Meanwhile, on their adventure, Snoopy and Woodstock find the sought-after treasure chest, but are quickly disappointed when they discover it's not riches, but instruments and photos from past summer concerts held at the camp. Newly inspired, Charlie Brown and the Peanuts gang use the treasure to host their own concert to save the camp.

When Snoopy's beloved doghouse is accidentally sold at a yard sale, he's devastated. After all, that's where his imagination first took flight and where he keeps all his favorite things.