I've read the book twice, although it's been a while, and I don't remember the 4th of July costumes, the mother's "convention" about the nanny cam, or the fact that Nanny lived in the house. I guess that's why it's "based" on... same spirit as the book but not exact.
__________________
It's gonna be a hootenanny.
Or maybe a jamboree.
Or possibly even a shindig or lollapalooza.
Perhaps it'll be a hootshinpaloozaree. I don't know.