On the day of ʿId-ul-Fitr and ʿId-ul-Adha a spear used to be planted in front of the Prophet (as a Sutra for the prayer) and then he would pray.  

أَنَّ النَّبِيَّ ﷺ كَانَ تُرْكَزُ الْحَرْبَةُ قُدَّامَهُ يَوْمَ الْفِطْرِ وَالنَّحْرِ ثُمَّ يُصَلِّي