In which of the following festivals are boat races a special feature?

Onam is the major harvest festival of Kerala, India, celebrated with great enthusiasm. The Vallam Kali (snake boat race) is a signature event of Onam, where spectacular boat races are held on rivers like the Pamba. These races feature long traditional boats (chundan vallam) rowed by dozens of oarsmen. Bihu, Navratri, and Pongal do not include boat races as part of their celebrations.