White Nights Festival

The White Nights Festival in St. Petersburg, Russia is an annual international arts festival during the season of the midnight sun. The White Nights Festival consists of a series of classical ballet, opera and music events and includes performances by Russian dancers, singers, musicians and actors, as well as famous international guest stars. The Scarlet Sails celebration is the culmination of the White Nights season, the largest public event anywhere in Russia with the annual estimated attendance about one million people, most of whom are students from thousands of schools and colleges, both local and international.
Organised by the Saint Petersburg City Administration, the festival begins in May with the "Stars of the White Nights" at Mariinsky Theatre and ends in July. However, some performances connected to the festival take place before and after the official dates.
Numerous night-time cultural festivals, White Night festivals, have been inspired by this, in French they are called Nuit Blanche.