A possible concise summary is:
Junior is a boy who wants to have a big birthday party with hundreds of friends, but he only has two friends, Cody and Joseph. He tries to invite other people, but they all reject him. He decides to lie and say that his party is for Roy, the coolest kid in the world, and that he has super bowl tickets and Drake as a guest. Roy agrees to come, and so do many other kids. Junior pretends that Cody is his hot sister, and Roy likes him. Junior becomes cool and popular, until Penelope, a girl he likes, discovers that Cody is a boy. Roy gets angry and leaves, and Junior's party is ruined.
Some possible facts extracted from the text are:
1. Junior is turning 13 years old and wants to have a big birthday party.
2. Cody and Joseph are Junior's only friends who show up to his party.
3. Cody gives Junior a Spanish version of the Cat in the Hat as a gift, and Joseph gives him wet puzzle pieces.
4. Junior tries to invite other people to his party, but they all reject him or make excuses.
5. Junior lies to Roy, the coolest kid in the world, that his party has super bowl tickets and Drake, and convinces him to come.
6. Junior, Cody and Joseph dress up like girls to impress Roy and other guests.
7. Roy takes Cody upstairs and thinks he is a girl until he discovers his wig.
8. Penelope, a girl that Junior likes, also comes to the party and dances with Junior.