YES Gansey and Blue need to thread so they can talk about things. Do you want to set something current or after Kavinsky arrives or IDK, when seems like a good time to Blue? But anyway, those two definitely need to talk about their relationship status in general and how they're feeling. (I actually don't know if Gansey knows that Adam and Ronan are in a relationship/whatever they are rn?)

Other things that should happen: Grantaire and Dorian should hang. Blue should meet Dorian because they could be interesting. I know WRT Grantaire and Dorian, I'm canon updating Dorian soon, and at the point I'm taking him from, he'll have inherited his father's seat in the Magisterium and be running his own political party in the Senate. That could be interesting, given Grantaire's own canon.