A Google invite link is a link that allows you to register your Google event with the Google Calendar app.
You can register an event for free using the Google Event calendar or a free app, such as Apple’s Event Calendar, or Google’s own Event Viewer.
Google invites are a way to get the Google app to display invitations for free events, and are not part of the Google App, Google News, or the Google+ app.
The invitation link is shown when you create an event on the Google Events app, so you can see if you have a free event on your calendar.
The link is only available on Android and Chrome browsers, but it can be opened in Safari on other platforms.
Google also recently launched a Google Calendar event app, which lets you set up and manage events from your Android phone, tablet, and computer.