International Romani Day (8 April)

Yes! The presenter on RNZ Concert FM mentioned it this morning, and then played Monti's _Csárdás_. I'm not sure that strictly qualifies, but I was glad to hear about the day.
"In Europe there could be as many as 5 million speakers, making it the most widely used minority language on the continent..." (Crystal)
Crystal recommends a document called "What Is The Romani Language?", from the Centre de recherches tsiganes at the Université René Descartes and the University of Hertfordshire. I don't think I managed to find that online, but the Council of Europe has a lot of information here:
https://rm.coe.int/roma-history-factsheets-eng/1680a2f2f8