https://www.cnet.com/news/in-google-maps-add-a-public-event-to-invite-everyone-to-your-next-party/

On the support page, Google said the feature might not be available in some regions. Here's how to check the availability and add a public event on your Android device:

Follow steps 1-3 to edit your event's details or to delete it. You can add photos, the date and time, the type of event you're hosting and more.