What is the event you want the player to be facing? Is it the event that's running this command? If so, how is the event triggered? If it's triggered by Action Button or Player Touch, then the player HAS to be facing it for the event to trigger.
If it's a different event, you'll have to compare the location of the player/event and what direction the player SHOULD be facing, and then check if they ARE facing in that direction. Won't go into any further details until you answer those questions.