Please follow these steps to cancel your plan:
1. Log in to your RingCentral Events account at https://hopin.com/users/sign_in
2. Click on your profile icon in the top right corner and access the needed organization by selecting it from the list in the dropdown menu.
3. Once you are on the Organization Dashboard, you can open the same dropdown menu and click Manage organization.
4. Go to the Billing tab and here click Cancel.
5. This will open a new page with your plan details. Here you will need to click Cancel plan.
6. Double-check the status of your subscription. If everything is done correctly and your subscription is cancelled, you should be able to see the cancellation date and the Renew plan option as displayed on the screenshot below: