Can you trigger a function with an event in a base class conditionally?

I've got a class, from which I create several derived classes. Almost all of these need to perform the same function based on an event, but a couple of them don't need to do anything. The base class initializes things at runtime like so:

button.Release += OnRelease;

OnRelease() is defined in the base class. I can make some of the derived classes do nothing upon release of the button, using the new or override keywords in front of

void OnRelease() {};

...or I can remove the event trigger in the derived classes like this:

button.Release -= OnRelease;

...but that's a bit messy for my taste. Is there a better way?