September 4th is a day for a lot of "National", but unofficial, days, and below are some of the special events being recognized on this day:
(1)National Wildlife Day
http://www.worldwildlife.org/(2)National Macadamia Nut Day
(3)National Hug Your Boss Day
(4)National Newspaper Carrier Day
(5)National College Colors Day
(6)National Lazy Mom Day
And, today (September 4, 2015) also happens to be "Force Friday", which probably won't be a "National Day" or a yearly event either but a one time day where many stores will be having sales on various "Star Wars" merchandise in anticipation of the new "Star Wars" movie being released later this year.