You need this to get it done:
Action DetailsRequirements and how-to articles for Facebook's action:
Pick a short, memorable title for your event. (maximum of 64 characters.)
The specific location where the event is going to be taking place.
Information about the event.
Choose a category which best fits your event (e.g. Games, Film, Causes, etc.)
Choose a cover photo to represent your event (if not using a video.)
Recommended size: 1,200 x 628 pixels (1.9:1 ratio)
Choose a cover video to represent your event (if not using a photo.)
Recommended length: 30 seconds to 5 minutes
Choose the frequency of your event (e.g. does it occur only once, or is it weekly/monthly/etc?)
Date and Time
Choose the date(s) and time(s) for when your event starts and ends.