Is this the archery contest?
If so: Look around the back of the camp and see 4 items hanging on wall that can be moved: shield by chieftain's tent entryway, the wok at top right screen, the turtle shell and pan framing the entryway at left of screen.
By trial and error and shooting the target, learn how to adjust those 4 items.
Each of those 4 items can be moved 3 times: left middle and right.