Q. I wanted to know if the itinerary that I have to mention in my overnight permit is flexible? What if we are not able to make it to the campsites mentioned in the itinerary and want to camp at an earlier campsite?
It is flexible. Naming where you plan to camp is only for documentation in case you are reported missing. It's purpose is to give search and rescue people an idea where to start looking. Rangers do not check that you are camping in the location stated.