The world's biggest gathering of humans

The world's biggest gathering of humans happens in India's Kumbh Mela Festival. Roughly 100 million people attend the festival. The festival is held every 12 years at Prayag (Allahabad), India. The exact date of festival is determined according to Hindu astrology: the Mela is held when Jupiter is in Taurus and the sun and the moon are in Capricorn. The festival involves ritual bathing at Triveni Sangam, which is the meeting points of three rivers: the Ganga, the Yamuna, and the mythical Sarasvati. The last Kumbh Mela took place in 2013. The next one is scheduled in 2025.