As a channel owner, you own the content you create. You can keep your webinars available for as long as you want. You can un-publish or re-publish your webinars at your own discretion in the manage area of the webinar.
1. Select the webinar in your Channel via the Manage button
2. Go to the Edit details section of your webinar
3. From the Edit details section you will be able to un-publish or re-publish your webinar.
4. Once these options have been changed always remember to click the Procced button to save your changes.