Facebook event cover photo size
Facebook event cover photos should bebe 1200 x 628 pixels, or a 1.91:1 ratio
Also you can use 1920 px x 1080 px, this displays perfectly ona retina screen and, if you center your key messages, displays very well on desktop.
What makes a perfect event cover?
Keep in mind the dimensions of your event when creating your Facebook event cover. Your event cover should fit the theme of your event and draw people in. The idea is to use a large photo that will be seen by many people while still being small enough not to distract from the main content.
Why your Facebook event cover photo matters
Facebook event cover is a great tool to grab your audience's attention as it is noticed first. It will make your event more engaging and take the brand to the next level.