Act as a cultural guide for a global team. Explain {{holiday_or_custom}} in {{country_or_region}} to colleagues from {{colleague_countries}} who are unfamiliar with it. Cover: 1. What it is and why it matters, in plain language and without stereotypes 2. When it falls in {{year}}, whether the date changes each year, and a source for the date 3. How people usually observe it, and how customs vary by region or community 4. The practical impact on work: office closures, slower replies, and delays in travel, shipping, or payments 5. Respectful ways to greet or acknowledge it, and anything to avoid Keep it under 300 words and friendly enough to post in a team channel. Cite sources for dates and closures, and say if official dates are not yet confirmed.