Releasing a video, Pannun asked supporters to raise Khalistani and Kashmiri flags in Lucknow and Prayagraj airports.
He was quoted as saying in the video by India Today: "Mahakumbh Prayagraj 2025 will become a battlefield."
Hundreds of Hindu devotees, including aesthetics, bathe in the confluence of the holy Ganges, Yamuna and mythical Saraswati during the holy event.
Hindus believe that bathing in the holy Ganges during Mahakumbh brings salvation from the cycle of life and death.
Meanwhile, Pannun threatened to target the religious event just days after three pro-Khalistan terrorists were gunned down during an encounter with Uttar Pradesh and Punjab Police in Pilibhit.