The Fête de la Musique, also known in English as Music Day, Make Music Day, or World Music Day, is an annual music celebration that takes place on 21 June. On Music Day, citizens and residents are urged to play music outside in their neighborhoods or in public spaces and parks. Free concerts are also organized, where musicians play for fun and not for payment.

The summer solstice or estival solstice occurs when one of Earth's poles has its maximum tilt toward the Sun. It happens twice yearly, once in each hemisphere. For that hemisphere, the summer solstice is the day with the longest period of daylight and shortest night of the year, when the Sun is at its highest position in the sky. At either pole there is continuous daylight at the time of its summer solstice. The opposite event is the winter solstice.