Look, I'm not asking you to join the military, or throw a party, or have a parade, or offer your first-born virgin daughter to a serviceman. I'm not asking you to even go find a serviceman, current or former, and thank him. (Although that would be a nice gesture.)
All I'm asking you to do is this:
Remember, for just a few seconds, that you enjoy the rights and privileges and whatever leisure you have* in this country, through the actions and the sacrifices of men and women wearing the uniform of this nation's armed forces. Wearing that uniform has few privileges attached to it, beyond the opportunity to have served this nation. With few exceptions, everyone who puts that uniform on is subject to being put into harm's way for their country.
If you will remember that for the next little while before enjoying the rest of your day, then I believe this Memorial Day has served its purpose to this nation.
*And/or the right to gripe about their absence.