Can date and time not be required?

maybe you can try to set the same date and time instead then use conditional placeholders – https://wp-events-plugin.com/documentation/conditional-placeholders/

Thanks but I don’t think that will work. My page has many events. Some have dates and times and some don’t. Using the conditional placeholders in the template is either all or nothing. Plus that doesn’t solve the issue of leaving the date and time blank and still being able to publish the page.

I see however that isn’t possible at the moment.