Meal trains are similar to other silly American imports
I remember DM signing up to local rotas to help or take stuff to new parents, ill people, the elderly when I was a child. She is in her 80s and would be astonished to think it was an imported idea.
DC have always gone to play with other DC, nothing new about that either.
In my day there was a leavers dance/disco in may schools.
Terminology may change or be imported but that doesn't make the concept "foreign" (and who cares anyway if its a good concept).