Only users with the Full Access 2021 or Online 2021 status can access the event pages. You can check your status in the Membership tab in your profile. In the same tab, you can find out the payment status of the invoice. If you have any additional questions, write a request to technical support.
If you chose Free status during registration, you can change your subscription in your personal account in the Membership tab by clicking on the Change Plan button and choosing a convenient payment method.