Two audiences, and only one of them is invited
The guest is seven or eleven; the person who decides, drives, packs the bag and wants to know who to call is a parent. An invitation that reads purely as a poster for the children leaves adults filling gaps with questions, which is why so many sleepover invitations end with fourteen separate messages about medicines and collection times.
A page solves this by being written for both. The children get the film, the pizza and the dates. The parents get drop-off, pick-up, the rules of your house, and a reply that records their child's name with the notes attached. That reply is what you read on the Friday afternoon.