Explore how countries celebrate profession-based days—from Teachers’ and Nurses’ Day to Engineers’ and beyond—why each date was chosen (pioneers’ birthdays, milestone laws, UN designations), and how observances differ across nations. Finish with a practical guide to track them using countdowns and upcoming lists.

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Major landmarks around the world regularly change colors to mark international observances and civic cause days. This guide explains who can request a landmark lighting, how dates and colors are approved, and where the public can track upcoming lighting calendars and set countdowns.

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Go behind the scenes of how governments announce public holidays: the provisional calendars you see first, the official gazette notices that make them law, and the last-minute changes that can catch travelers, HR teams, and content editors off guard. Learn the timelines, terminology (provisional vs official, in-lieu/substitute, observed), and practical tracking tips to keep countdowns, trip plans, and ‘On This Day’ entries accurate.

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