Radhashtami is celebrated on the eighth day of the bright fortnight (shukla paksha ashtami) in the month of Bhadra (August – September). It is a very significant festival for the devotees. Radharani is the mother of the entire universe and on this auspicious day devotees pray to Her to bless them with Krishna-bhakti.
Radha, Krishna's
Female Counterpart
The
complete conception of God includes God and His energies, which exist
simultaneously with Him and are in a sense identical to Him. The sum of
Krishna's energies is Radha, His eternal consort. Like the sun and sunshine,
Krishna and Radha are one.
Radha embodies the totality of love for Krishna. Thus She is known as the
personification of Bhakti, or loving devotion to God.
Loving God is our natural state, now dormant. By Her pure example, Radha is the
beacon calling everyone to re-awaken full love for Krishna. She also dispenses
mercy to help us achieve that goal.
Radha-Krishna are the male and female aspects of God. Known as the Divine
Couple, together they are the full manifestation of God.
"Radharani is a tenderhearted feminine counterpart of the supreme whole,
resembling the perfectional stage of the worldly feminine nature. Therefore, the
mercy of Radharani is available very readily to the sincere devotees, and once
She recommends such a devotee to Lord Krishna, the Lord at once accepts the
devotee's admittance into His association." —Srila Prabhupada, Bhagavatam 2.3.23