One of mythological beliefs that is previous to Incas times and still survives is the cult to Pachamama, the mother earth.
Main festivity is in August but I found a ceremony as they were opening a new market with aborigines handicrafts, so they were making offerings.
Here, a hole dug at earth where Pachamama is fed.
They put coke leaves, chicha, food, alcohol, cigarettes.. naming her and adding kusilla kusilla..(help me, help me)