Have you seen the screen that comes up when you try to hit the gong? I was trying and it wouldn't ring but this screen came up and it said time will tell what other mysteries lay hidden beneath the surface of Isola and who or what is the source of the magic. A clue for vv3?
You dont acually ring the gong with the hand, you place a villager on the gong, and leave them highlighted and look below the action line to see the effects.
And yes it is a hint, just like the writings on the wall, have you read that one yet?