First make some defenses.

If you don't want your buildings and farm or whatever attacked dig a moat.

Easiest way to deal with an event is to crouch and hide where you can't be seen. Clear out whatever spawned after the event ends.

With iron you can even put up stone walls.

With a moat they will spawn and just stand there unable to get to you and you can just shoot them easily.

I put a roof over my boar pen.. now it is a boar house that even protects them from flying threats.