Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.152.
Section : Making up a missed ‘id prayer.
Abu ‘Umair ibn Anas reports: “My Ansari uncles from among the companions of the Messenger of Allah said to me: ‘The moon for the month of Shawwal was hidden from us and, therefore, our companions fasted. Then at the end of the day, riders came and they bore witness to the Prophet sallallahu alehi wasallam that they had seen the moon the previous night. The Prophet ordered the people to break their fasts and to go out to the site of the salatul ‘id on the next day.'” This is related by Ahmad, an-Nasa’i, and Ibn Majah with a sahih chain. In this hadith there lies evidence for those who say that if the people miss salatul ‘id due to some excuse, then they may go out and pray it the next day.