Some Island Event if chose correctly can give you some hints about the childern's parent and Biggle as well
I have seen enough Island Events to guess what happen to the children's parent,they are serching for other tribe,But reason why they left the village is unclear.
As for Biggle,they asked what happen to thegong which we know is broken into four pieces,but I still don't know why they want to know what happen to gongs and the next Island Event I gotten suggested that someone broke the gong for some reason not some sort of accident to the gong.
So I'm sorry if you don't understand all those thing butanyway if you has some sort of theory you can post them here

So I think the Gong has some sort of dangerous effect on villages.

Good theory Nemyar!

So Biggle want the Gong and Children's Parent want to hide the gong or something like that I think.So any Theory you want to share with us?

Nope, as I haven't got the biggle event yet.

Or some Island Event that you don't understand it's might help my theory

Well have you completed this the vine wall puzzle? Take a look at this message from it:

Well it kind of help make my theory true
is the gong is dangerous and one of the villagers broke it
I also think the recent one is written by children's parent

I don't know if it's dangerous. But I suppose they broke it for the best. As the gong may be in possesion, by someone. Does that make sence?

Maybe