1. Srila Prabhupada discusses Govardhana-puja

    The sacrifice known as Govardhana-puja is observed in the Krsna consciousness movement. Lord Caitanya has recommended that since Krsna is worshipable, so His land — Vrndavana and Govardhana Hill — is also worshipable. To confirm this statement, Lord Krsna said that Govardhana-puja is as good as worship of Him. From that day, Govardhana-puja has been going on and is known as Annakuta. In all the temples of Vrndavana or outside of Vrndavana, huge quantities of food are prepared in this ceremony and are very sumptuously distributed to the general population. Sometimes the food is thrown to the crowds, and they enjoy collecting it off the ground. From this we can understand that prasadam offered to Krsna never becomes polluted or contaminated, even if it is thrown on the ground. The people therefore collect and eat it with great satisfaction.

    From Srila Prabhupada's Krsna Book, ch 24: Worshiping Govardhana Hill