Assumption Day on 15 August is a nationwide public holiday in Andorra, Austria, Belgium, Burundi, Cameroon, Central African Republic, Chile, Republic of Congo, Côte d’Ivoire, Croatia, Colombia, Costa Rica, Cyprus, East Timor, France, Gabon, Greece, Georgia, Republic of Guinea, Haiti, Italy, Lebanon, Liechtenstein, Lithuania, Luxembourg, Republic of North Macedonia, Madagascar, Malta, Mauritius, Republic of Moldova, Monaco, Montenegro (Albanian Catholics), Paraguay, Poland (coinciding with Polish Army Day), Portugal, Romania, Rwanda, Senegal, Seychelles, Slovenia, Spain, Syria, Tahiti, Togo, and Vanuatu;[56] and was also in Hungary until 1948.
Puzzled myself.
Edit: did a search, and I’m guessing this one: https://en.wikipedia.org/wiki/Assumption_of_Mary
Probably a holiday only in Catholic countries, and very likely not in protestant ones.
Relevant map (no valid source, just took the first image from DDG):
Checks out, more or less: https://www.axa-schengen.com/en/blog/holidays-europe-country
Indeed, from Wikipedia