QUESTION AND ANSWER
Can I Restore An Expired Webinar?
Once expired, there is no way to restore a Webinar.
A possible workaround for the problem could be to schedule a new Webinar based on the expired one (Copy Webinar dropdown), run a registration report on the expired session to get a list of the registrants names and emails and manually register them for the new session. Of course the feasibility of this approach depends on the number or existing registrants.