I have a group of (what I think

are amazing photos... I have determined that the pictures were taken in downtown Los Angeles by using the photo with the vertical "Hotel California" sign...
The float with the "Bomb Shells" & the Eagle with the Shield on the front, is stunning!
My question:
What is going on here? Just a parade? or is it symbolic of some big event? I am guessing early 1920s? What do you guys think?
Also, on the last photo, what do you think the tower thingy sticking out of the top of the trees is???
Thank you!
Shawn