1 – Doing ghusl before going out to the prayer.

Praise be to Allaah.  

It was narrated in a saheeh hadeeth in al-Muwatta’ and elsewhere that ‘Abd-Allaah ibn ‘Umar used to do ghusl on the day of al-Fitr before going out to the prayer-place in the morning. Al-Muwatta’ 428. 

Al- Nawawi (may Allaah have mercy on him) said that the Muslims were unanimously agreed that it is mustahabb to do ghusl for Eid prayer. 

The reason why it is mustahabb is the same reason as that for doing ghusl before Jumu’ah and other public gatherings. Rather on Eid the reason is even stronger.