how to embed a Google Calendar into Blogger. The video is seven years old and Google Calendar has changed a bit since then, but the question was still a good one. The question was, "instead of showing all the details how do you set so that the public only sees an event as busy?"
When you make one of your Google Calendars public you have the option to either "show all event details" or "see only free/busy." You'll find this option by opening your calendar's "settings and sharing" menu then scrolling down to "Access permissions." See my screenshots below for details.
On a related note, here's how you can display the same event on multiple calendars.