This first photo is an 8x10 reproduction of a newswire photo that shows the moment of Houdini's head first dive into the pool. Christopher had it correct that this is the West Coast; however, the original caption on the back of this photo places it at "a swimming pool in Los Angeles" and shows the date May 7, 1922. (But it's likely the year was actually 1923.)
This next photo, which I just purchased on eBay, is an original shot taken at the event, probably by the same photographer who took Kevin's pic as the angle is the same. Unfortunately, it does not include Houdini (this is how I could afford it), but you can easily match the spectators to the photo above, and I think I can see Jim Collins back there. But what makes this pic most significant is that it takes us one step further and identifies this as the pool at the historic Ambassador Hotel in Los Angeles.
The Ambassador Hotel was famous for its Coconut Grove nightclub and also as the site of Robert F. Kennedy's assassination in 1968. The hotel was closed to the public in 1986, and at one time Donald Trump wanted to build the worlds tallest building on the property. After years of legal wrangling, in 2005 the hotel was demolished and the Robert F. Kennedy Community Schools were built on the property.
I used to go to the Ambassador quite often. It was a wonderful L.A. landmark that seemed frozen in time. Shame that I didn't know then it was the also the site of what I think we can now call "Houdini's Ambassador Hotel pool escape".
Check out this wonderful tribute video to the Ambassador featuring photos of the hotel and pool during its heyday.
UPDATE: I've at last been able to nail down the exact date and details of this escape. Check out: What do Houdini, surfing, and Robert Kennedy have in common?