Make Past Events actionable

When an event date has passed, the event remains visible in the ‘Past Events’ section. This is great. However if a user is browsing past events, there is no easy way to enable them to watch the event replay. We host our replays on our KB (Zendesk) via Wistia and so it would be great if we could, at some point after an event has passed, change the greyed out ‘Attend’ button to ‘Watch Replay’ which then links to a custom URL. Bonus points for making this possible from the events list, as well as when you click into an event listing.