By and large, Flag Day is one of those "holidays" that people either don't know about...or ignore.
However, my elementary school made a huge deal about it. We sang flag songs, took a school picture in front of the flagpole, made little flags and learned the history of flag day.
All these years later - my elementary friends and I still wish each other a happy Flag Day (and Army birthday) on Facebook. It's still a precious memory that only a select group of us share. :-)