The seven meet the trio

what happens when Percy, Annabeth, Piper, Jason, Calypso, Leo,Hazel, Frank, Thalia, Rachel, Nico, Will, and Percy's half-sister Cinderella pop into a room with chairs and a stage and see four strange people their. One girl with brown hair, another with orange, a boy with the same color of orange hair, and a boy who looks like a younger percy with greener eyes. What will happen when a note falls from the roof with a note from aphrodite.
This takes place 1 years after the giant war, Cinderella, Nico, Hazel, and Will are 16. Cinderella and her boyfriend Drake fought in the Titan war at 14 and Percy, Annabeth, and RED are 18 and the rest of the seven are 17. Also the golden trio are 16, this is before their war.