Is a Puzzlement -- every year

I understand about the department stores.  Christmas gifts come but once a year.  But why are the grocery stores so crowded just before Christmas?

Yes, I know people are buying the turkey and the fixin's for the 25th of December.  Buy where do all these extra people get their food on, say,  the 12 of April?  Or the 29th of September?  Do they fast the other 51 weeks of the year?  Or do they grow all their own food and raise their own cattle and pigs but have difficulty raising turkeys?

Is a puzzlement.