Hellooo! So, outside of the obvious ones that we've already discussed!
Alex (~sobachka) went to Aurelius with Jahan and while he wasn't in with the foursome, he was friends with him nonetheless (and Jahan and Alex's significant others are bffs, so they're stuck with each other regardless at this point). So he would definitely know Remi and probably frequents the bakery because he likes sweets.
Rowena (~ofhyrule) is part of the Hyland family, who is similarly very old money that ended up settling in Dunhaven. I feel like that means the Parkers and Hylands would probably know each other as family friends and the like. They might also know the Steeles that way, since I feel like the Hylands are the sort that politicians would want to court for donations. So these are potential things~
Annnd I think those are the obvious connections! But you can have anything else. as well, if you think of it. :3