instead of Canadian Grand Prix: https://www.formula1.com/en/latest/article.turkey-to-replace-canada-on-2021-f1-race-calendar.5oXc8g8NfkRUrlydMahSVF.html

new Covid-19 travel restrictions meaning it's no longer possible to race in Turkey on June 11-13; that weekend will now remain free, with the French Grand Prix moving a week earlier than originally planned to June 18-20 and a second race in Austria – the Styrian Grand Prix – added to the calendar on June 25-27: https://www.formula1.com/en/latest/article.breaking-2021-f1-calendar-reshuffled-as-turkey-drops-off-and-extra-austria.3TufMtNBGTB4ALrfGaiN9e.html