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Easter and its related holidays are moveable feasts, not falling on a fixed date; its date is computed based on a lunisolar calendar (solar year plus Moon phase) similar to the Hebrew calendar.
International Literacy Day celebrated on September 8th each year, aims to raise awareness about the importance of literacy and promote initiatives to improve global literacy rates.
Arbor Day (or Arbour Day in some countries) is a secular day of observance in which individuals and groups are encouraged to plant trees.
Pongal, also referred to as Thai Pongal, is a multi-day harvest festival of South India, particularly in the Tamil community.