You can embed a YouTube video into your event description when creating an event.

When creating your event, add or edit your event description from the Event Page step, then click on the video icon. From here, paste your YouTube video's URL into the URL field and select Add.

Your buyers can then watch this video on your event page before or after buying tickets. 

Please Note: Buyers must first accept site cookies to watch your embedded video or you can enable "Privacy-Enhanced Mode" when copying your embed link from YouTube so anyone can watch your video.