I noticed also. Other years they have had special events, offers, troops, etc. Probably politically motivated to not participate now that celebrating Independence Day is now considered an act of "white supremacy".
There was no special event on the 6th of December either (the Independence Day of Finland). I'm so irritated and disappointed. :S
The community of this game is international. I really don't understand why national holidays of the USA (or any other country) should be celebrated specifically.