Yoast Local SEO Plugin breaks your maps:

Thanks for letting us know.

It sounds like the problem may be where the Google Maps scripts are included multiple times in a single page which is a common issue where multiple plugins/themes each work with Google Maps.

That being the case, you may need to devise a mean of selectively turning off either our or Yoast’s map scripts (if it is only a problem on event related pages, then of course selectively deactivating Yoast’s stuff on those pages is probably the way to go).

Hope that helps!