Your event name can appear in two places: on the "Welcome Screen" and on your digital album. These titles are managed separately, so updating one won’t automatically change the other.
To update the digital album name, go to your dashboard, open "Event Settings", and under the "General" section, edit the Event Name field.
To update the "Welcome Screen" title, go to Event Settings > Appearance > Edit Welcome Screen, then change the "Title" under the "Appearance" tab.