The AmbubachiMela is a fertility festival celebrating the menstrual cycle of the goddess Kāmākhyā. The goddess Kāmākhyā is depicted as a young woman, with twelve arms and six heads (pictured below). Around this time of the year, devotees flock to the Kāmākhyā temple in Guwahati city, India. Devotees place a red cloth on a yoni (योनि). A yoni is a stone symbolic of the female genitalia. For three days the temple is closed to visitors. After three days, the temple is purified and visitors are allowed into the temple.

Here is a great video showing you the exterior of the temple :