Originally posted by Zep Tepi:

Only boss kills advance the event clock. But after the Elder it will check if you have killed a troll for the troll event. Secure your base before killing the Elder.

I think this is wrong. Ground is shaking and you are being hunted only enter the event pool after one of troll/wolf is killed, and it do not have to be by you. They also stay in the event pool even after killing their native biomes boss. This is how I understand these events.
Correct my please if I'm wrong