mamangam festival was celebrated on the bank of the river
Mamankam festival Māmānkam (Tamiḻ/Malayāḷam: Māmāngam/Mahāmaham or Māmākam) was a duodecennial medieval fair held on the bank, and on the dry river-bed, of Pērār (River Nil̥a, River Ponnani, or Bhāratappuḻa) at Tirunāvāya, southern India. The Hindu temple associated with the festival was Nava Mukunda Temple, Tirunavaya. It seems to have begun as a temple festival, analogous to the Kumbha Melas at Ujjaini, Prayaga, Haridwar and Kumbakonam.[1]
Ganesh Chaturthi It is unclear when the festival started, it became a major social and public event with sponsorship of Shivaji after Mughal-Maratha wars, and again in the 19th century after public appeal by Indian freedom fighter Lokmanya Tilak,[14] who championed it as a means to circumvent the colonial British government ban on Hindu gatherings through its anti-public assembly legislation in 1892.[15][16][9]