If you are the admin of the event, you can add a photo by clicking "Edit Event" at the top right of...
If you are the admin of the event, you can add a photo by clicking "Edit Event" at the top right of the event page. From there, click "Add Event Photo" to upload a photo for the event. If you'd like to upload more photos, you may post them on the Wall of the event.
If you are a guest, post photos on the event Wall. You can add photos to the event from photo albums you have created on Facebook, upload a photo from your computer, or take a photo with a webcam.
If this is a public event, the photos will be visible to everyone who views it. The photos posted on private events are only visible to other people who were invited. Admins also have the ability to remove photos that they do not want to be associated with their event.