Like many Hindu festivals, references to it are not found in any major extant Purāṇa. Nevertheless, it is to be celebrated according to the procedures prescribed in digests such as the Nirṇaya-Sindhu, Varṣa-Kṛtya, and Kṛtya-Sāra-Samuccaya. For example, the Varṣa-Kṛtya attributes the relevant narrative to the Bhaviṣyottara-Purāṇa.
Regards,
Kushagra