Mother’s day is the busiest restaurant day of the year. Scrapping it would lose millions of dollars for the restaurant industry and their employees.
If a restaurant went broke because of no mother’s day, they were going broke anyway.
I worked in a restaurant in my early days. Mother's Day was literally hell on earth. That is the WORST time to go to a restaurant. Take it from somebody who worked in one. You would not believe what goes on in the kitchen to keep up with the orders. Not to mention the second-line waitstaff trying to keep up with it all. (Some of the senior waitstaff want that day for themselves).
You are much better off cooking a nice meal for your mother and wife at home - on the grill!