The international day of the music

Fête de la Musique always takes place on 21st of June. The midsummer day others like to call Kupala. It is the international day of music, celebrated in many countries.
Since 2009 the Inkijkmuseum organized Fête de la Musique in Eindhoven.
A free music festival with very very diverse music.
You can already note that day in your agenda.