The MacMillan family, all fifth to seventh years (for Teddy's sake), Severus Snape, Remus Lupin, Minerva McGonagall, and the Tonks family are invited to celebrate Teddy and Draco finishing their education on Saturday, June 20th.
[all played characters can be assumed to be invited since Teddy talks to most everyone via the journals and the Malfoys are trying to improve their stance at the Ministry]