It's been a while since I played that far back in the story, so I could be misremembering, but I thought that all scenes involved going to the party and sitting outside with Hailey. From there June comes out, and you can continue her path then the MC goes back inside for the Jaylen scene and the discussions about what happened to Alyssa. Aside from June's scene, I don't recall any critical variables for any other LI at that specific party.
This game is definitely on "rails" and each LI has extra switching stops where you divert then are brought back to the main story rail. The wrestling and studying scenes on Paige's path, going to the Spa and on Transit with Alyssa's path, painting and the truck/van rental on Athena's path, the park trip/picnic on Leslie's path, the extended beach party scene on Brooke's path, the date nights with June, and the rest.
Some did have a bit more time than others, but I personally thought each LI had a reasonable number of exclusive scenes.
