The Hosts & panelists card and Attendees card will indicate that the invites are not yet sent. To send the invitations to cohosts and panelists, click the Send now button at the top right of the Hosts & panelists card.
You can also add cohosts and panelists by clicking the corresponding Edit button and adding the name(s) of the cohost(s) or panelist(s). Click Update now to send the invitation.
Go to your Google Calendar or Microsoft Outlook to send the invitations to attendees.