Yes to Clover, Roald, and Scorpius! Maybe one day he'll reference it like yeah remember that one year when you were obsessed with love stories? You always talked about them! and it'll be funny. and awks.
Callum will definitely join the club and luff his cousin and it will be awesome :)
Aaand with Louis, that all works, I'm sure he asked her to go to Hogsmeade back in like fourth year or whenev. Yay!