Day of Ashura
The Day of Ashura (عاشوراء (ʻĀshūrā’, Ashura, Ashoura, and other spellings) is on the 10th day of Muharram in the Islamic calendar. Several narrations point to the significance of this day from the earliest of times. Commemoration of this day includes fasting.
Based on sightability in North America, in 2021 Ashura will start on August 18. Note that in the Muslim calendar, a holiday begins on the sunset of the previous day, so observing Muslims will celebrate Ashura on the sunset of August 17.
NOTE: The Islamic calendar is based on lunar observation; thus, the above date may vary by one or two days. Dates apply to North America.