The social networks may store an old version of the image for your event. You can tell the social networks to use your new image.
Troubleshooting Google Calendar Invites
Luma should automatically add your events to your Google Calendar. You can see how that works and see how to troubleshoot it.
Email Delivery + Open Troubleshooting
Learn how email tracking works and how to troubleshoot any issues.
Problems with Email Auto-Clickers
Email security extensions can cause issues by auto-clicking links in your Luma emails.