Lets see... Hermione - Neville sent out questions on the CCTV, so she can answer stuff there? She's one of his Muggle stuff experts ^_^. Drishti and she can bristle at each other more. That's always fun. Justin is always up for chatting.
Fleur - Drishti is always an option. She can easily pull Fleur into the parent crowd if you like? Justin has banking things to do, same with Neville. Not huge stuff, but definitely an option. And maybe an opening to more? Justin of course won't be all gaga over her being gay, so that would be a change for her. Terence and she might bond over snark? Especially over snark regarding English?