I'll organize the big event, but you've gotta get her a present. I can pick out some gifts for her, too, but at least one of them should be straight from you. Gotta do things right.
Oh, and you should decide who's going to be there for dinner. I don't know exactly how serious she and Gojyo are which is still really weird to think about, but I know he doesn't have anyone else to celebrate with.