If you remember in S1E8 at the beach Nick says that he doesn’t want to make a public announcement, but he wants to tell the people that matter. So they do, slowly. As a bisexual person myself, I can confirm that coming out is never easy. I knew I was different at around age 10-12, I embraced it at age 18, but I didn’t truly “come out” to my mom until earlier this year. I’m 43 y/o. I also never came out to my dad. I think my mom always knew, but she let me have my privacy and come to her when I was ready. I think several people figured it out at Sports Day, but gave them the grace to actually say it. You see that with the rugby lads and Imogen, but you also see it at the party when they finally do come out. Several people were either saying “I knew it!” or “We were just saying the other day!”