Contact

Email hello@whathappen.today. A person reads every message.

Reporting a wrong holiday

Tell us the country, the date and what is wrong, and include a link to the government announcement or official calendar. We fix confirmed mistakes as quickly as we can and note the source.

API and MCP questions

For problems with the API or the MCP server, send the exact URL or tool call, the response you got, and what you expected. Please do not include personal data. If you plan heavy use, say roughly how many requests a day so we can keep the service healthy for everyone.

Everything else

Ideas for countries to add, mistakes in the history pages (those come from Wikipedia — fixing the Wikipedia article fixes it here at the next update), and general feedback are all welcome. We cannot offer support for other websites or apps.