I attended the 'Id prayer along with the Messenger of Allah ﷺ. When he finished the prayer, he said: We shall deliver the sermon; he who likes to sit for listening to it may sit and he who likes to go away may go away. Abu Dawud said: this is a mursal tradition (i.e. the successor 'Ata directly reporting from the Prophet ﷺ and omitting the link of the Companions).  

شَهِدْتُ مَعَ رَسُولِ اللَّهِ ﷺ الْعِيدَ فَلَمَّا قَضَى الصَّلاَةَ قَالَ إِنَّا نَخْطُبُ فَمَنْ أَحَبَّ أَنْ يَجْلِسَ لِلْخُطْبَةِ فَلْيَجْلِسْ وَمَنْ أَحَبَّ أَنْ يَذْهَبَ فَلْيَذْهَبْ