public bool TryInitializeEvents(out AnimancerEvent.Sequence events)

In general, the first time this method is called on a particular state it will return true to indicate that the `events` are not initialized yet so the caller can configure them.

More specifically:

• If the haven't already been assigned, this method will acquire a spare from the and return true.
• If the have already been assigned, this method will do the same as above and also copy the assigned `events` into the new sequence so the caller can configure them for this state without affecting the original source of the events.
• If this state already owns its events (because this method was already called or the property was accessed), this method will output null and return false.

Documentation: Animancer Events

Example:

var state = animancerComponent.Play(animationClipOrTransition);
if (state.TryInitializeEvents(out var events))
{
    events.SetCallback("Event Name", OnAnimationEvent);
    events.OnEnd = OnAnimationEnded;
}

If you only need to initialize the End Event, consider using the Animancer.AnimancerState.Events example instead.