Halloween 2020 is a Saturday.
— edisøn (@ed_omar1) November 1, 2019
New Years and Christmas are a Friday.
4/20 is technically the entire month.
2 Friday the 13th, March and November.
July 4th is a Saturday.
Cinco de Mayo is on a (Taco) Tuesday
2020 about to be litty titty
You probably haven't thought much about what 2020 will bring outside of personal plans and the US presidential election. You may be surprised to learn all the oddities of the calendar coming. For example, February 2 is Super Bowl Sunday, but it's also Groundhog Day and Palindrome Day. The date will be 02/02/2020 no matter which side of the pond you are on. Other things to keep in mind:
For one thing, the two Friday the 13ths; the one in March is the day before Pi Day (3.14), and the one in November is exactly midway between Halloween and Thankgiving.
The Lunar New Year is Saturday, January 25th and begins the Chinese Horoscope Year of the Rat (or more specifically, the Year of the Metal Rat... as opposed to a ProgRock or HipHop Rat?)
The month of November is especially complicated. Daylight Savings Time ends at 2AM on November 1st, which is essentially Halloween night, so the Witching Hour gets an extra hour. The 1st is also the New York Marathon, so runners get an extra hour of sleep.
There are also come offbeat holidays and anniversaries of historical milestones to celebrate, as you can see in an extensive post at Metafilter.