Receiving a letter
Harry, Hermione, and the 20 underage children were sitting at the table eating breakfast when they suddenly heard a knock on the window. Hermione went over and let in a owl which had a letter. It had been a long time since Harry or Hermione had experienced this and was a first time for the kids as they didn't use owls in Canada.
Hermione read out the letter which was from Arthur and Molly. It was an offer for the to attend the upcoming family reunion. Once the letter was read the family had a conversation together, as well as over face time with the adult children.
The family of 32 decided to all attend the reunion and so sent back a letter saying so.
Once this whole situation was over the two parents began answering a lot of questions.