Simplify the following text for a Grade 8 native English-speaking person.
Original: 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 .
Simplified: The Scarlet Sails celebration is the big climax of the White Nights season , the largest public event anywhere in Russia . About a million people visit the festival .