Analysis by John Martini (Dec 1 2018):   The above Sacramento photo was taken during the 15th National Irrigation Conference in September 1907. Major clue is the legend over the stage reading: “Science Bids the Desert Drink” which the Mormon publication “The Young Woman’s Journal" reported was displayed over the stage during the conference.  The same publication reported the “Ogden Tabernacle Choir” performed at this convention. The Ogden group was one of two “Mormon Tabernacle Choirs,” the other being the more famous choir singing at the Salt Lake City tabernacle. My bet is the choir visited the Cliff House before or after the Sacramento conference, and that their badges read “Ogden Tabernacle Choir / Irrigation Congress".  Since the choir arrived in San Francisco on September 4th, and performed on the nights of the 4th and 5th, the Cliff House photo was taken within two or three days of the fire.

More on the Ogden Tabernacle Choir here