This is a very cool video that showed up on YouTube recently--it was taken in what looks like the late 1920s or early 1930s in Danville, Illinois. That just happens to be my neck of the woods. A few have suggested this is a Grand Encampment due to the numbers of Knights Templar in the short film. I had another thought about it.
I wonder if it's not part of the funeral of Joseph "Uncle Joe" Cannon in 1926. Uncle Joe, who was from Danville, was the former Speaker of the House of Representatives. His funeral was attended by thousands--probably the largest event Danville, Illinois had seen prior to that, or since. As a Mason, and a member of the Knights Templar in Danville's Athelstan Commandery (no longer in existence) Freemasons turned out from all over the United States to show their respects.
|Joseph (Uncle Joe) Gurney Cannon 1836 - 1926|
Uncle Joe was also a member of Olive Branch Lodge No. 38, also in Danville--that lodge still exists to this day.
Anyway, that's my theory on what this video portrays, but if anybody else has better information, please let me know. Without a doubt, the Knights Templar today would sure like to see numbers like that again.