I wish that were true because I was looking for that in another topic. However, both leaving the string empty and not defining a marker in Alcscript (which to PyPRP are the same since the empty string is its default) will fire the event at the end of the animation.
Using an an empty string for the DoorButtonTouch animation for example means that it fires after the avatar puts its arm down. The marker is at the point where the arm is stretched.