In the editor, tap Add background to open the picker.

Three options:
- Shaders — subtle animated gradients that give your page movement
- Textures — a pattern layered over your event. Paper, linen, confetti, topography, and more
- Colors — simple solid backgrounds
Pick one and it previews live on your event page. You'll see the change immediately.
Removing a background
Tap the X next to the background pill in the editor. Back to the default.
Backgrounds and cover photos
They work well together. The background shows behind and around the cover image. A textured background with a clean photo can look really good without any effort.
See also: Adding a Cover Photo, Editing Event Details