No.
I find the idea of a Memorial Day sale abhorrent.
I don't have a problem with those who take advantage of a sale, but personally have always avoided Memorial Day sales. Doesn't seem right profiting off a day set aside for those who are no longer here.
Have no problem going to the lake or whatever and enjoying the day, as I think everyone should enjoy the freedoms that are dearly paid for. Making money off it though isn't for me.