You can watch the replay of a Peatix Live event only when the event replay function is enabled by the event organizer.
The replay will be viewable on the Watch Stream page after the end of the live broadcast. To watch the replay, click the Play button (a triangle icon ▶) at the center of the Peatix Live player.
The date and time in which the replay will be available till is displayed above the event title and date/time.
For details on how to access the Watch Stream page, check this help page: How to join a Peatix Live event (PC).