The first full moon of the autumn season marks the celebration of Krishna's dancing with the gopis. On this day the Deities of Vrindavan are nicely decorated in white and Krishna-lila dramas are enacted. Because the moon is very auspicious, the Brijbasis leave pots of sweet rice exposed to the full moon for the whole night to turn the sweet rice into ambrosial nectar. The following passage is from Krishna Book, Chapter 29:
"When Kṛṣṇa, the supreme enjoyer, desired to enjoy the company of the gopīs on that full moon night of the śarat season, exactly at that very moment, the moon, the lord of the stars, appeared in the sky, displaying its most beautiful features. The full moon night of the śarat season is the most beautiful night in the year. In Indian there is a great monument called Taj Mahal in Agra, a city in the Uttar Pradesh province, and the tomb is made of first-class marble stone. During the night of the full moon of the śarat season, many foreigners go to see the beautiful reflections of the moon on the tomb. Thus this full moon night is celebrated even today for its beauty.
When the full moon rose in the east, it tinged everything with a reddish color. With the rising of the moon, the whole sky appeared smeared by red kuṅkuma. When a husband long separated from his wife returns home, he decorates the face of his wife with red kuṅkuma. This long-expected moonrise of the śarat season was thus smearing the eastern sky.
The appearance of the moon increased Kṛṣṇa's desire to dance with the gopīs. The forests were filled with fragrant flowers. The atmosphere was cooling and festive. When Lord Kṛṣṇa began to blow His flute, the gopīs all over Vṛndāvana became enchanted. Their attraction to the vibration of the flute increased a thousand times due to the rising full moon, the red horizon, the calm and cool atmosphere, and the blossoming flowers. All these gopīs were by nature very much attracted to Kṛṣṇa's beauty, and when they heard the vibration of His flute, they became apparently lustful to satisfy the senses of Kṛṣṇa.
Immediately upon hearing the vibration of the flute, they all left their respective engagements and proceeded to the spot where Kṛṣṇa was standing. While they ran very swiftly, all their earrings swung back and forth. They all rushed toward the place known as Vaṁśīvaṭa. Some of them were engaged in milking cows, but they left their milking business half finished and immediately went to Kṛṣṇa. One of them had just collected milk and put it in a milk pan on the oven to boil, but she did not care whether the milk overboiled and spilled—she immediately left to go see Kṛṣṇa. Some of them were breast feeding their small babies, and some were engaged in distributing food to the members of their families, but they left all such engagements and immediately rushed towards the spot where Kṛṣṇa was playing His flute. Some were engaged in serving their husbands, and some were themselves engaged in eating, but neither caring to serve their husbands nor eat, they immediately left. Some of them wanted to decorate their faces with cosmetic ointments and to dress themselves very nicely before going to Kṛṣṇa, but unfortunately they could not finish their cosmetic decorations nor put on their dresses in the right way because of their anxiety to meet Kṛṣṇa immediately. Their faces were decorated hurriedly and were haphazardly finished; some even put the lower part of their dresses on the upper part of their bodies and the upper part on the lower part.
While all the gopīs were hurriedly leaving their respective places, their husbands, brothers and fathers were all struck with wonder to know where they were going. Being young girls, they were protected either by husbands, elderly brothers or fathers. All their guardians forbade them to go to Kṛṣṇa, but they disregarded them. When a person becomes attracted by Kṛṣṇa and is in full Kṛṣṇa consciousness, he does not care for any worldly duties, even though very urgent. Kṛṣṇa consciousness is so powerful that it gives everyone relief from all material activities. Śrīla Rūpa Gosvāmī has written a very nice verse wherein one gopī advises another, 'My dear friend, if you desire to enjoy the company of material society, friendship and love, then please do not go to see this smiling boy Govinda, who is standing on the bank of the Yamunā and playing His flute, His lips brightened by the beams of the full moonlight.' Śrīla Rūpa Gosvāmī indirectly instructs that one who has been captivated by the beautiful smiling face of Kṛṣṇa has lost all attraction for material enjoyments. This is the test of advancement in Kṛṣṇa consciousness: a person advancing in Kṛṣṇa consciousness must lose interest in material activities and personal sense gratification."
Note: Please refer to Srila Prabhupada's instructions on how to properly understand Krishna's rasa-lila dance: