There are many Sunnahs of Hajj. Among the notable ones are:
(1) Performing ghusl before entering ihram.
(2) For men to wear white ihram garments.
(3) Reciting the Talbiyah.
(4) Staying in Mina on the night preceding the 8th of Dhul-Hijjah.
(5) Making du‘a after throwing pebbles at the small and middle Jamarahs.
(6) For those performing Qiran and Ifrad Hajj to perform Tawaf al-Qudum.
However, if a Sunnah is missed for any reason, no dam is required.