In the name of Allah, the most Beneficent, the most Merciful.

Answer

The Khutbah in Arafa is sunnat, however, if someone is present in Masjid Namirah it is necessary for him to listen to it attentively.  (Muallimul Hujaj p.152)

Only Allah Knows Best

Mohammed Tosir Miah

Darul Ifta Birmingham