It’s a battle I think that’s been lost. Sorry.
I think most people, at least of the church-going variety, can get to Easter Monday being the day after Easter Day – so, April 17. And Easter Tuesday is April 18. But regularly I find, especially in the advertising world, that last week, Friday April 14 is called “Easter Friday”. Of course it is not. Easter Saturday is tomorrow April 22; today is Easter Friday, April 21. And Easter Week follows Easter Day, it does not precede it. Palm Sunday does not commence Easter Week, it begins Holy Week.
So if there has been an advertisement selling at discount during “Easter Week”, demand that the discount price applies from the week following Easter Day! But, as I say, I suspect this is a battle we’ve lost.