There are two equinoxes every year, in March and September, when the Sun shines directly on the equator, and the length of night and day are nearly equal.

Many Christians in the United States remember Jesus’ triumphal entry into Jerusalem on Palm Sunday, which marks the beginning of Holy Week. This day is also on the Sunday before Easter Sunday.

Passover (Pesach) generally lasts for eight days in the United States. Many Jewish people spend the Passover period with family members or close friends.

March 29 is National Vietnam War Veterans Day in the United States. First observed in 2012, it honors the US military members who served during the Vietnam War (1955-1975).

César Chávez Day is observed in the United States on March 31 each year. It celebrates the birthday of César Estrada Chávez and it serves as a tribute to his commitment to social justice and respect for human dignity.

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.