Thank you so much for the feedback, it's always super helpful to get someone else's point of view to see where things were not as clear as I thought. I had to rush things a bit as this was mostly made in a week as I was away on vacation the first two weeks of it :)
Regarding the ritual, my main idea was to have some kind of vague adventure seeds of sort the players would have to accomplish in parallel to the ritual continuing. The seven drummers are meant to be village elders performing the ritual and not necessarily the players themselves, I should have clarified that, but I guess some turns of even could allow some of the players to be part of them (the challenges they would have to accomplish would then be something more like internal struggle or connected to a dream plan of sort maybe).
As I said I had to rush a lot of things to finish it in time and the writing as well as the mechanics are still very rough on the edges. I'll try to find more time to figure it out and polish it better when I can though.