Once a guest opens and views your invitation, your guest list will show Viewed XX minutes ago or Viewed XX days ago directly under the guest's name on the guest list. You can locate your guest list by following these steps:
1. Log in to your Evite account.
2. Click on your name/photo in the top right corner.
3. Select My Events.
4. Locate your event.
5. Click on the event title.
6. Scroll down to the Who's Coming.
7. Click on See All Guests.
This will bring up your guest list with their viewed status.