This is a very old promotional video from Kaiser/Willys Motors. The film apparently comes via Periscope Film, who makes old films available for licensing. (You can see many of their old documentaries in lower quality via YouTube; beware, a massive time sink awaits you there.)
It shows three early Jeep events: the 6th annual Jeepers Jamboree over the Sierra Mountains, a Jeep Rodeo (mud race) in Yakima, Washington, and a Jeep Derby (desert race) near Truth or Consequences in New Mexico.
Doubtful you’ll ever see as many CJs in one place as you can in these films. Most were CJ-5s, but there were definitely a few flatfenders in there, including the winner of the Derby, a CJ-3B.
Perhaps the most interesting technical tidbit to me from the film was some Jeepers would disconnect their fan belts before a water crossing to avoid spraying more water into the engine. I’ve never heard of that technique.