Memorial Day is observed on the last Monday of May. Originally a day to commemorate the dead of the American Civil War, people began observing Memorial day in 1868 on May 30. In 1971, the holiday moved to the last Monday in May to make a three day weekend.
Considered the official start of summer in the USA, this weekend is the first big party weekend of the summer. In some cities, there are events such as laying of flowers, prayers, and ceremonies to honor the dead of all wars. Many women’s war organizations created the traditions that continue today including the decorating with flowers on the graves. (Today, the poppy is considered the flower of remembrance from the poem about Flanders field and the poppies growing among the graves of the fallen soldiers.) Many towns will celebrate with parades, including in the DC area, with the arrival of the Harley Davidson crowd.
A selection of barbecued meats some which show a smoke ring (from low and slow cooking).
But, today, many consider the three day weekend (the first holiday weekend since February), a start to the summer season and reason to barbecue. American barbecue is divided into “low and slow” and grilling. I’ll go into the “low and slow” and those various types, as in Texas or Southern style barbecue, another time.
To mark the start of summer, in Virginia, outdoor pools are only be open from Memorial Day weekend to Labor Day weekend which is the first weekend in September.
The important thing is to get outside and grill something!
While there are official holidays in the United States, there is no mandatory vacation time. These are the federal (national government) holidays (paid days off) from the US government site, OPM:
Monday, January 01
New Year’s Day (since 1870)
Monday, January 15
Birthday of Martin Luther King, Jr. (observed since 1986 but only by all states since 2000)
Monday, February 19 *
Washington’s Birthday (since 1879 on February 22 but became the third Monday from 1968)
Monday, May 27
Memorial Day (since 1888 as Decoration Day)
Wednesday, June 19
Juneteenth National Independence Day (since 2021)
Thursday, July 04
Independence Day (since 1870)
Monday, September 02
Labor Day (since 1894)
Monday, October 14
Columbus Day (since 1968)
Monday, November 11
Veterans Day (since 1938 as Armistice Day to commemorate the cessation of fighting on the 11th hour of the 11th day of the 11th month)
Thursday, November 28
Thanksgiving Day (since 1941)
Wednesday, December 25
Christmas Day (since 1870)
*This holiday is designated as “Washington’s Birthday” in section 6103(a) of title 5 of the United States Code, which is the law that specifies holidays for Federal employees. Though other institutions such as state and local governments and private businesses may use other names, it is our policy to always refer to holidays by the names designated in the law.
If the holiday is on a Saturday, then the holiday is on the Friday before and if the holiday is on Sunday, then the holiday is observed on the Monday following. Oddly for the past many years, most holidays on the weekend have been on Sundays. The only holidays that do not change date are New Year’s, Juneteenth, July 4, Veterans Day, Thanksgiving, and Christmas. The others are considered “floating.”
In some countries like Italy or Peru, a “bridge” weekend would be when people take the day off between the holiday and the weekend. I think in the US, it is called a long weekend. For example, I can predict that because July 4 falls on a Thursday, many people will take vacation on Friday, July 5 to make a long weekend, just as many do on the Friday after Thanksgiving.
There are two holidays for the armed forces, Memorial Day and Veterans Day. Memorial Day is for those who died in while serving in the armed forces and Veterans is for those who served in the armed forces. As of 2018, there 18 million veterans in the United States, seven percent of the adult population.
These are the country-wide official government holidays but some states have their own holidays as well. Every four years, Inauguration day is a federal holiday when the new president is sworn in. 
The only days when almost everything is closed (for half a day sometimes) are Thanksgiving and Christmas day. On those days, the airports are open and Chinese restaurants are especially busy. For many Americans who work for the private sector, they have to choose between certain days off such as Columbus Day.
Ronald Reagan National Airport
For many, Memorial Day and Labor Day mark the beginning and ending of summer. In some states, outdoor pools may be only open during this season. And some people only where white slacks during this season. Or is it white shoes?
