Google Tests a Search Card for Live Events

There's a Help Center article about a Google experiment that shows relevant Hangouts on Air in Google Search. "We're rolling out an experiment where you can easily find YouTube live events or Hangouts on Air to watch by searching for the event on Google.com. For example, if an author is answering questions about their latest book in a Hangout on Air, you can search the author’s name to find and watch the event," informs Google.

Apparently, a live event will start to show up in search up to 3 hours before it starts. You can find a list of Hangouts on Air and YouTube live events.

"If the event is happening now, you can touch the play on the video to watch the event live. If the event is happening later in the day, click Yes under 'Are you going to watch?' to add the event to your Google Calendar."