In every summer season, the Char Dham pilgrimage is open for pilgrims between April to October. The Char Dham Yatra includes four shrine places in Uttrakhand in India. It includes Yamunotri, Gangotri, Badrinath, and Kedarnath. One of my friends recently went on this Yatra with her family. She took a Char Dham Yatra by helicopter package it also helps her mother who can not walk much in the hills. It was a good experience to have a sacred journey with family. Now, I can't resist myself to go on this sacred Yatra after hearing her. Here is the website by which she booked her journey.
