This means no sales, no themed merchandise, no decorations. December 25 and most other day are treated just like any other day for all stores malls, restaurants, ect.
You’d still get non religious holiday events like mothers days, or independence days.
What whould change?
They’re thinking ahead : Prime Day and Target Day are becoming big sales events not attached to any holiday
But those days are different; it is more about clearing out old inventory.