Here is your short paragraph on Chuda Maha festival:
Buddhist texts have mentioned that Devas celebrated the festival Chuda Maha meaning ‘Great Head-dress’, of Prince Siddharth. There is a story connected with Buddha’s head dress.
When he reached the opposite bank of the river Anauma, he took off his head dress and cut off his hair with his sword.
He said “If I am to become a Buddha, these two must remain suspended in the air.” But before they could be dropped, a Deva took hold of these things.
This legend is depicted in the early art at Bharhut, Amaravati and Nagarjuna Konda. Buddhist devotees throng these places and offer prayer.