It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) used to deliver the sermon on the pulpit on Friday, on the day of Eid al-Fitr and on Eid al-Adha; and on Friday, when the mu'adhdhin finished the call to prayer, he (peace and blessings be upon him) would stand up and deliver the sermon.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11469