Chapter Twenty-one contains twenty verses, describing how Krishna entered the forest of Vrindavana in the autumn, playing His flute, and how He attracted the gopis, who were singing His glories. The Twenty-second Chapter contains thirty-eight verses, describing how the gopis prayed to the goddess Katyayani to obtain Krishna as their husband and how Krishna later stole the garments of the gopis while the gopis were bathing in the Yamuna.
(A.C. Bhaktivedanta Swami Prabhupada. Srimad Bhagavatam 10th Canto Summary.)
The full story of Katyayani Vrata in Isvara Archivio