I’ve not had a chance to try out your suggestions, but after updating to the latest version of Events Calendar, all is now working again. Thanks for your help!
I followed your instructions (added billing to google console account, made sure theme api was different), but the maps are still not showing. The Transition Tool (https://mapsplatformtransition.withgoogle.com/) says my project is in good shape with no errors, so I’m not sure what else I can do…