You can cancel your paid subscription on AddEvent.com in the 'Membership and Billing' section of your account. Click the 'Change Plan' button as shown in the image below.
You'll be taken to a plans and pricing page where you can change your plan or billing cycle. If you'd still like to unsubscribe, simply click the colorful 'Change' button on the tile of your current paid plan, as shown in the image below.
A pop-up will appear, as shown in the image below, where you can switch between your paid plan renewing monthly or annually. If you'd still like to cancel your paid subscription at this point, simply click the red 'Unsubscribe' text.
If you cancel your paid subscription in the middle of a subscription period (which is one month for monthly plans, 12 months for annual plans) your account will be transformed into a pre-paid account and your subscription will continue to function as a paid subscription until the period ends. At that time, your paid subscription will be canceled and your account will be downgraded to a Hobby Plan. You will no longer be billed for anything unless you decide to re-upgrade your account again in the future.