A holiday in one city or district — a patron saint's day, a fair, a founding.
A local holiday applies to a city, municipality or district rather than a region or a country. Patron saints' days across southern Europe are the classic case, along with market fairs and founding anniversaries.
The power is usually delegated: a national or regional government allows local authorities to declare a fixed number of days, and each chooses its own. That makes them numerous, genuinely local, and published in places that are hard to reach — a municipal bulletin rather than a national gazette.
The corpus holds them where a subdivision is recorded at city level, and does not claim to hold them comprehensively. There is no country in which every municipal holiday is centrally published.
Regional is a subdivision with its own competence. Local is usually a delegated power exercised by a city, and there are far more of them.
See also regional holiday · public holiday · jurisdiction
Municipal holidays are not comprehensively held for any country, and no country centrally publishes them. See what we hold.