Yes there are multiple ways to deal with events like this.
1. you don’t want players to wander too far in the forest you made but still want them to explore: use the collision pen and draw a zone on the map. Players will not be able to go beyond and an invisible wall will stop them.
2. if you don’t want them to explore in first person view for whatever reason, you can also restrict a certain view, forcing them to explore in top view for example (like Divinity).
3. You can press the combat button to freeze all your players on the spot.
4. You can use the complex event feature that does triggers: draw an invisible square on the ground, when any player steps on it, it does a “macro” of actions like : freeze players>show trap>start combat music 2>fog 50%