Tradition?
It appears to me that folk are so 'flexible' these days that tradition seems to have flown out of the window.
Throughout my childhood, certain days meant certain happenings would occur.
Friday was bath night - yes, it only happened once a week! English breakfast would happen every Sunday morning. Sundays were always special - including roast dinner and a family outing in the afternoon. The weekly shop was done on Thursdays etc.