Just think how versatile the phrase “Happy Holidays” is”:

It covers:
- Halloween (Oct. 31)
- All Saints Day (Nov. 1)
- Daylight Savings Time Ending Day (Nov. 5)
- Election Day (Nov. 7) Oops - not a Holiday but should be
- Veterans Day (Nov. 11)
- Thanksgiving Day (Nov. 23)
- Chanukah (Dec. 13)
- Winter Begins (Dec. 21) Also Winter Solstice - a Holiday in Alaska as the days start getting longer
- The Real Merry Christmas Day (Dec. 25)
- Boxing Day for the Brits and Canucks (Dec. 26)
- New Years Day (Jan. 1) Another oops, save that Happy Holiday for 2018

See, just one phase covers a whole shitload of “Holidays”. Just using “Happy Holidays” means you will never have to remember which Holiday comes next.