The cave painting festival takes place at the 
Caves on Summer 8.
Attend the festival by entering the Caves in the 
Forest any time before 6pm.
Chat with the Pachan Clan, dance to music, and hear the story of the Cave Lion told by 
Tetih.
The main event of the festival is painting on the cave wall. Go up to any blank cave wall and interact with it to see the interface to paint.
Select any of the brown pots to choose a paint color then click and drag to paint that color anywhere on the canvas. To erase, use the towel icon. To change colors, select any pot (even ones currently holding a color can be replaced with a new color choice).
There is no judging for the paintings. You are free to walk away and come back to paint as many walls as you'd like. When finished, the Player must exit the caves themselves to end the festival, where it will now be 10pm.