Google has began rolling out an experimental feature on its search engine that makes it easier to find live events on YouTube or Hangouts on Air. A live event will begin showing up in search results up to 3 hours before it starts, providing users with a link that takes them to the event page to watch. A card-like box appears at the top of Google when searching for the name or author of live events. 

If the event is happening at a later date, there is also the option to add it to your Google Calendar. As mentioned by the Google Operating Systems blog, a lists of upcoming events that you can watch is available on the Hangouts on Air and YouTube Live events pages. Keep in mind that, as live event alerts are currently in testing, you may not be able to replicate them in your own search results yet.