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?
We can have these without the commercialism can’t we? Homemade decorations and costumes have more value and the act of making them with your family provides the time to talk about what these traditions are about.