Ata (may Allah have mercy on him) reports that Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) sent him to Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) when allegiance was first given to him, (with the message) that the adhan used not to be given for the prayer on the day of Eid al-Fitr, so do not give the adhan for it. So Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) did not give the adhan for it. Along with that, he also sent him (the message): "The sermon is only after the prayer, for that is what used to be done." He said: So Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) led the prayer before the sermon.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6166