I found this photograph in a lot I had purchased from Rhode Island and immediately went on a search for what was happening.
After pecking around a bit I found a webpage that just listed the sign in back in relation to the USS Los Angeles. I ended up calling the Los Angeles Maritime Museum in San Pedro, California. I ended up posting it on the museum’s Facebook page, asking if they would like for me to mail the photograph to them. I got a YES, with a little information:
This photo is from the ship's commissioning ceremony, July 22, 1945. That's LA Mayor Fletcher Bowron at the microphone, his wife christened the ship.
Having a date to go by now, I clicked around and found a Wikipedia page HERE.I am happy to say that this photograph will be on it’s way to the museum very soon!