The answer is Summerween!
Because Halloween fun should be celebrated more than once a year.
I am sure that sometime and somewhere in this world, someone thought it would be neat to have a summer version of Halloween. The idea of Summerween is not new, but it was somewhat popularized by one of Disney's Gravity Falls episodes. Their version of Summerween is a Halloween in summer, but with jack o'melons and its own mythical creature, the Summerween Trickster. The fact that they used watermelons instead of pumpkins inspire me. I like how pumpkins look but I don't like how they taste. I much prefer watermelons. I won't go into details on who the Summerween Trickster is because I know I will end up sharing Gravity Falls spoilers.
Feel free to celebrate Summerween on June 22! I know I will. I am going to carve jack o'melons and decorate the house. I just hope it won't attract the neighborhood rodents and raccoons.