Will businesses be open on Christmas in Mexicali?

I am planning to spend most of my Christmas break in Mexicali. I will be arriving late on 12/23 and staying through the New Year. How many things can I expect to be closed during Christmas? My main concern is food/restaurants. The hotel where I stay only serves breakfast. So I will be on my own for the rest of the meals? Can I expect restaurants to be open? Should I stock up on food as soon as I get there on 12/23? Will taxis be running at all? Any insight into what should be open in Mexicali (or other parts of Mexico for comparison) is welcome.