As I dropped DD (4yo) to preschool today her best friend gave her a party invite (undoubtedly a party invite as it said 'party' on the outside and X invites Y on the inside, where the best friend had meticulously written her own and DD's names). So I read it all out to DD and she was thrilled (she's only ever had one other party invite from school and that was a year ago). She gave her best friend a big hug, said thank you and wanted to hold onto the invite all day long.
The invitation didn't mention a day or time which I assumed was because a 4yo had filled it in so joked with best friend's mum about it who turned around and said 'Oh no, there is no party, her birthday is in July'. Turns out best friend wanted to give out an invite but there is no party and her mum let her.
Isn't that a shitty thing to do to a 4yo? DD will not only remember this, she will obsess over when she will be able to go to this party.