How to Tell if Someone Has Seen Your Facebook Event Invitation on iPhone or iPad

Open Facebook. It’s the blue icon with a white “f” on your home screen. If you're not signed in to Facebook, enter your account information and tap Log In now.

Tap ☰. It’s at the bottom-right corner of the screen.

Scroll down and tap Events. It’s in the “Events” section.

Select your event.

Scroll down and tap Invited. It’s beneath the “Write Something” box. This button also displays the number of people on the invitation list.

Scroll to the person you want to see. If the person has opened the event invitation, the word “Seen” will appear beneath their name, along with a gray check mark.