Q. The two Eid prayers; al-Fiṭr and al-Aḍhā, are they compulsory (wājib) or recommended (sunnah)? And what sin would the person incur if they were to abandon these prayers?
A. The two Eid prayers; al-Fiṭr and al-Aḍhā, both of them are communal duties (farḍ kifāyah), though there are scholars who say that both of them are individual obligations (farḍ ʿayn) – just like the Jumuʿah prayer. At any rate, the believer must not abandon them.
Fatāwā al-Lajnah al-Dāʾimah li’l-Buhūth al-ʿIlmiyyah wa’l-Iftāʾ (8/284)