If I hear this once more 
Yes, they are closed for one day. It's Tuesday. Tuesday the shops are closed. I shop on a Sunday night, for the week. Every week. Why are friends and family, who seem to be overly invested in each other's shooing this week, insisting I do not need to buy a trolley load because the shops are shut for one day?
I'm not going shopping on Monday, Wednesday, Thursday, Friday or Saturday either. I don't care the shops are only closed for one day, it's Tuesday, I don't shop on a Tuesday anyway.
People are nuts. Don't buy your weeks shopping because the shops are only shut for one day. WTF. I do a weeks shopping on a Sunday night every single week.