I’ve just found back an email: my announcement from 3 years ago made to the parents of our son’s class:
‘Parents of children from 2nd grade – attention attention!
Walter (7ys) invited yesterday already some of his friends for his birthday party in December.
The invitations were perfectly made, only the date, time and location is missing from some of them.
Plus he couldn’t exactly tell who he has already invited.
If you happen to see a mysterious invitation card where – with a bit of luck – the name is indicated, please let me know, and you will receive some additional irrelevant details. Have a nice day all!