The delivery of Hanuman is commemorated during Hanuman Jayanthi within the thirty day period of Chaitra (March or April). During this festival, devotees flock to temples committed to Hanuman inside the early hrs in the morning, wherever officiating priests bathe idols with the deity and provide them Unique prayers. https://www.youtube.com/watch?v=6cAOQp6Twlc&t=7s