It is narrated from Ibn Sirin (may Allah have mercy on him) that after finishing the Eid al-Fitr and Eid al-Adha prayers, the Prophet ﷺ would deliver the sermon while mounted on his camel.
Hadith Referenceمسند الإمام الشافعي / كتاب العيدين والأضاحي والاستسقاء / 493