Creating static events?

I'm trying to create an Event system within my game so that I can chain components together. One example of this would be an InputManager handling an event where after the player presses "WASD" keys, the movement script subscribes to the event and runs.

What is the optimal way of doing this? Should I make the InputManager a static class to access the events from all my other scripts, or should I just run FindObjectOfType for every other script?

Thanks!