How to solve heat wave in survival mode?

Once I had levelled up to Research level 2, my chief could draw up plans about a Rain dance. I then tried taking 4 villagers to the Kraken pedestals again, and this time they got up on them, and prayed.

But the first villager had already finished by the time I got the fourth up on a pedestal, so I had to keep putting them up on the pedestals several times, before the Kraken was enough satisfied to stop the heat wave. However, presumably there was something about it which I still need to improve, because the little text window which appeared, basically said that the praying hadn't been good enough to also grant the villagers with some rain.

After drawing up plans and make a solution for rain, I was able to add an 11 year old male and 3 random males to pray at the kraken (after trying to mark each one, some would pray and some wouldnt, unsuccessfully with the same clothes) then finally it says the kraken is pleased but no rain, and the heat wave has ended. Right now my research is at 3, farming at 5, medicine at 3, construction at 5 and crafting at 3

Put an adult on each kraken pedestal to pray simultaneously.