Junie B Jones and That Meanie Jim's Birthday, Book 6 by Barbara Park

Meet the World’s Funniest Kindergartner—Junie B. Jones! That meanie Jim has invited everyone in Room Nine to his birthday party on Saturday—except Junie B.!

Should she have her own birthday party six months early and not invite Jim?

Or should she move to It’s a Small World After All in Disneyland?