I don’t have enough context to determine which Monday you mean and in which country or region to check for a holiday. Holidays are highly regional (national vs regional/local), so the answer depends on the specific country and even the city or state. If you can share:
- the country (and if relevant, the state/region or city),
- and the date you’re referring to (e.g., Monday, November 10, 2025),
then I can tell you whether that particular Monday is a holiday for that jurisdiction and any related observances.