Back in the day,
there were no cellphones,
so when people made plans
they did not confirm them
Can you imagine that?
Being completely dependent on the fact that someone is showing up
Looking for them in the crowds
Praying nothing has happened to them,
Worrying
You can't communicate with them in any way.
What you can and should do is:
have faith in them; trust them
They should know: this trust once torn, cannot be stitched
and if this is not motive enough for them to come
then nothing is