In the last 500 years, shakti sadhaks of eastern India personally felt the unity of these two imoprtant forms of hindu pantheon . Many songs and poems were composed in honour of this united form which was named KRISHNA-KALI . In many such song the sadhak poses himself as a little child requesting his loved mother to drop her ghastly look to assume the more pleasing form of Krishna with kadamba garlands , yellow robes and enchanting crown of flowers and peacock feathers .
This day is also commemorated in Bengal as Phalaharini Kalika Puja , which takes place in the amavasya(new moon might) of jyestha(april-may) month. this is a time when india is abound with scented flowers and sweetest of fruits like mango . so it is custom to offer all seasonal fruits to Kali at this day . offering of fruits also symbolises the surrender of ego and karmic reactions of a man to the supreme .
The video shows the transformation of Kali to Krishna set in the background of a song on the subject . It was written by a nineteenth century self realized kali sadhak known as Premik Maharaj . The first few lines of the song translates as —-
” My mother has become Krishna on seeing the enchanting night of full moon in the season of spring .
my black moon(Kali) has now started the divine play of holi .
ah ! behold the mesmeric beauty on her body , which is now covered with coloured holi powders and blood .
Dakini , Sakini , Yogini , Hakini and all her other companions have become mad with divine love and thus have turned to gopinis (cowherd damsels)