Annually, on April 21 (Apr. 20 in leap years) a crowd of foreign tourists and Iranians gather at Saadi's tomb in order to mark the day.

This commemoration day is held on the 1st of Ordibehesht, the second month of the Solar Hijri calendar (see Iranian calendar), the day on which Saadi states that he finished the Golestan in 1256.
Annually, on April 21 (Apr. 20 in leap years) a crowd of foreign tourists and Iranians gather at Saadi's tomb in order to mark the day.
This commemoration day is held on the 1st of Ordibehesht, the second month of the Solar Hijri calendar (see Iranian calendar), the day on which Saadi states that he finished the Golestan in 1256.
Saadi Shirazi