Wikipedia
Nandotsava
Nandotsav is a festival celebrated the day after the festival Janmashtami, which celebrates the Lord Krishna's birth. It is believed that all the villagers of Braj visited Nand Baba's house to see little Krishna and congratulate Mata Yashoda. Nand Baba distributed ornaments, clothes, cattle and various other valuables among saints and sages. All saints and sages bestowed blessings on Lord Krishna in return.
In Vrindavan this festival is celebrated in the Radha Vallabh Temple.
Panchamrit abhisheka and Maha aarti are performed in honour of Lord Krishna's birth. On this day people celebrate ' Govinda'- Devotees form small groups and break Maakhan Haandis tied to ropes on high rise buildings.