Everything just says 'Event'

The calendar will just use “Event” as a placeholder if your event has no title in Google. If there is no information showing up it might be because of your event template tags. What do you have set for that? (it’s the textarea above all your calendar settings)

The events all have titles. Is there anything else I can check?

Do you have a link that I can check out?

You could try running through this to make sure there are no conflicts also: https://docs.simplecalendar.io/troubleshooting-theme-plugin-widget-conflicts/