Hey Sasha! I think we were in AF together, eons ago. I recognise the icons, bwahaha~
Anyway! Yes, Katie and Draco have bartender things to bond on. And to be fair, they both got reprimanded by Addie-poo. I'm not sure she's over the necklace thing, since she still doesn't touch necklaces, but I think the details have been blurred enough with time that no, she doesn't hold Draco solely responsible. Fortunately, she was never as hyper-competitive as, say, Oliver, so she won't hate him for Quidditch reasons. Besides, she secretly adores any and all Slytherins~
Oliver would not so fondly remember Draco. His shenanigans with the hippogriff, his buying the team better brooms, generally being a prat, so on. But he'll try to give him a second chance!