Summerween (event)

Summerween is a holiday celebrated only in the town of Gravity Falls, Oregon on June 22. It is celebrated because the residents of Gravity Falls love Halloween so much that they celebrate it twice a year. They use jack-o'-melons instead of jack-o-lanterns, since pumpkins are not ripe during the summer.

Summerween Activities
Everyone in Gravity Falls celebrates the holiday like it is Halloween. They light up their jack-o-melons and dress in costumes, then they give out the candy to trick-or-treaters. When Summerween is over, the jack-o-melon's lights are put out.

History
Mabel and Dipper are very excited to go trick-or-treating for their last year. But Wendy invites Dipper to Tambry's party and he says he wasn't trick-or-treating so he could hang out with her. Mabel, Dipper, Soos, Candy and Grenda are then visited by the Summerween Trickster and have to collect 500 pieces of candy by the time the last jack-o-melon went out.

Dipper refuses to go trick-or-treating because he is "sick" but after a while, Mabel convinces him to put on his costume and get the most candy. Dipper wears a peanut butter costume and Mabel wears a jam costume. After the group collects 499 pieces, Mabel overhears Dipper talking to Wendy and realizes that he was planning on going to a party. She is very upset with him and doesn't talk to him.

Dipper put the wheelbarrow behind some bushes, unknowingly letting it fall into the creek behind the bushes. The trickster corners everyone in the Summerween Superstore and eats Soos. Soos eats the Summerween Trickster from the inside, revealing that the Summerween Trickster is made up of unwanted candy.