Howdy jrosenberg,
The page that our calendar creates is a run of the mill “WordPress custom post type archive page”. It looks like Yoast does support those in my quick google searches. You might checkout this linke, and google for the above term for more: https://wordpress.org/support/topic/seo-metadata-for-archive-page-using-custom-post-type-cpt?replies=2
Cheers!
– Brook
Forgot to add, in WordPress empty archive pages return 404s. This is true if you create a post category that has no posts. And it’s also true if you create an event page that has no events. Hopefully that makes sense, it is a little technical.
Cheers!
– Brook