To connect a calendar:
In your HubSpot account, click the settings settings icon in the top navigation bar.
In the left sidebar menu, navigate to General.
Click the Calendar tab.
Click Connect your Calendar.
In the dialog box, click Google / Gmail or Office 365, then click Connect your calendar.
Review the information in the dialog box, then click Accept and connect to [Google/Office 365] to give the meetings tool access to your calendar.
On the Google sign-in page, select the account you want to connect to, then review the permissions. Click Allow to continue connecting your calendar.
You'll be redirected to the meetings dashboard, where you can manage your calendar settings.