Harry's reunion and Ginny's vengeance

Harry is invited to his primary school reunion, he doesn't want to go but Ginny wants to get a bit of petty revenge on Harry's so called former classmates, and the Dursley's of course. What will his fiesty redhead come up with? Oneshot (unless you want more) H/G Vernon and Petunia bashing. slight Dudley bashing if you squint.