In Christianity, particularly among Catholics, this day commemorates Jesus Christ's triumphant entry into Jerusalem, marking the start of Holy Week. Observances include attending mass and processions.

Christians worldwide observe Good Friday to commemorate the crucifixion of Jesus Christ. It's a day of mourning, reflection, and prayer.

Celebrated by Christians globally, Easter Sunday marks the resurrection of Jesus Christ from the dead. Traditions include attending church services, festive meals, and egg-related activities.

An international observance promoting environmental protection and awareness. Established in 1970, it's celebrated with events, clean-up activities, and educational programs.

Recognized in various cultures, May Day celebrates the arrival of spring. In many countries, it's also International Workers' Day, honoring labor rights and workers' contributions.