Upon realizing the upcoming summer break will be the last one the Equestria Girls will have as high schoolers, they decide to throw a huge party at the end of the break to celebrate it. The plans quickly escalate, and quite soon the girls decide that their party will be a three day festival. But to throw such a massive party, many preparations will have to be made. And it would probably be fun if Princess Twilight could come over as well, and maybe even her friends.