Hi Athira, PFA complete guide for Uttarakhand, I can also share some numbers with you for package and all, you can plan your own trip and if you are visiting manali I'll suggest you to spend one day at solang valley about 8 km. from manali.
Happening of Kumbh Mela As per ancient scriptures of sanatan dharma, based on planetary positions the Kumbh Mela happens at various places. Pilgrimage and Festival. It is celebrated in a cycle of approximately 12 years at four river-bank pilgrimage sites The Normal Kumbh Mela is held every 3 years.
Https://www.kumbhmela.co.in/kumbh-2021/