Maundy Thursday, also known as Holy Thursday, is a Christian observance in the United States. It is the day before Good Friday and takes place during Holy Week. It commemorates Jesus Christ’s last supper and the initiation of Holy Communion (the Eucharist), observed in many Christian churches.

Good Friday occurs two days before Easter Sunday in the United States. It is the day when Christians commemorate Jesus Christ's crucifixion, which plays an important part in the Christian faith. It is not a federal holiday in the United States, although it is a state holiday in some states.

Many Christians in the United States observe Holy Saturday, which falls between Good Friday and Easter Sunday. It commemorates the day when Jesus Christ lay in the tomb after his death, according to the Christian bible. It is also known as Easter Eve and is the last day of Lent.

Many Jewish communities in the United States mark the last day of Passover as the end of a Jewish holiday that celebrates the deliverance of Jewish people from slavery in Egypt. Passover is also known as Pesah, Pesach, or the Feast of Unleavened Bread.

Many Christians celebrate Jesus Christ's resurrection on Easter Sunday. The Easter date depends on the ecclesiastical approximation of the March equinox.

Easter Monday is the day after Easter Sunday. It is not a federal holiday in the United States of America (USA). Some Easter traditions continue on the Easter Monday, such as the egg rolling race at the White House.

National Tartan Day is a US observance on April 6 each year. It commemorates the Scottish Declaration of Independence, from which the American Declaration of Independence was modelled on. It also recognizes achievements of Americans of Scottish descent.

Librarians across the United States celebrate National Library Workers’ Day (NLWD) on the Tuesday of National Library Week, held in April every year.

Many United States residents mark Tax Day as the deadline to file their income tax details to the Internal Revenue Service (IRS). The date is usually on or around April 15. However, this deadline may be extended to accommodate holidays or extreme weather conditions.

The Boston Marathon is held in the city of Boston, Massachusetts on Patriot's Day, the third Monday of April. First held in 1897, it is the world's oldest annual marathon.

Administrative Professionals Day® highlights the important role of administrative professionals in all sectors of the modern economy worldwide. It is on the Wednesday of Administrative Professionals Week®, which is on the last full week of April.

Oklahoma Day, which is annually held on April 22, commemorates the date when the "Oklahoma Lands" area, which is now the state of Oklahoma, opened for European settlement.

https://www.daughtersandsonstowork.org/ Take our Daughters and Sons to Work Day is not a public holiday. Businesses have normal opening hours. Each year on the fourth Thursday in April, National Take Our Daughters and Sons to Work Day encourages parents to take their children to work. This annual event is an educational program in the United States…

The United States was one of the first countries in the world to celebrate Arbor Day, a holiday dedicated to tree planting. National Arbor Day in the USA is celebrated on the last Friday in April. Besides, each state celebrates its own state tree planting holiday. Arbor Day was founded by Julius Sterling Morton, a…