While performing this act
While performing this action, some people also do Itikaf, starting after Laylat al-Qadr. It can be performed on Arafah and Ashura. If you don't do this action, you're supposed to clothe or feed sixty poor people. In between performing it, the Night of Power is celebrated and tarawih is said. This action ends at the beginning of Shawwal, and it starts during the fajr, before which suhoor must end. Outside of Islam, it is performed on (*) Tisha b'Av and sometimes during Lent. This action, also known as sawm, is ended at iftar and Eid al-fitr, using dates. For 10 points, name this action performed throughout the day during Ramadan.
While performing this action, some people also do Itikaf, starting after Laylat al-Qadr.