These holidays have become so commercialized in the US (for better or for worse) that having classes is the right thing to do. It keeps kids safe begu”r, away from dangerous activities and away from pritzus.
Considering that the US is all about free market prosperity, a special sale and shopping day is the right way to celebrate the 4th of July. It isn’t the right way to celebrate Memorial Day, but that is what happened to it and to Veterans Day, so it is best we don’t celebrate and just keep shteiging or working as we would on a weekday.
I treated Labor Day in the US as I treat Communist Labor Day May 1 here – a day to davka desecrate by shopping and working (same as I did on krachtzmas – I hit 13th Ave on both Labor Day and the 25th when I lived in NY.) If I had access to a red flag, and if it meant anything anymore which it doesn’t, I would do a Neturei Karta job on one in public here on May 1.
On the other hand, 9 May, Armistice Day, is a real holiday in this part of the world and I observe it accordingly in memory of those who died to stop the Nazis YMS – who of course were just one step worse than the Communists YMS of May 1 fame.