Laying the foundations for the synagogue on Cara Urosa Street, Belgrade

I think that this must have been at the laying of the foundations for the temple on Cara Urosa Street in Belgrade in 1907. As you can see there are a lot of people there and I am sure that Jakov Kalef, my paternal granduncle, is among them. I just cannot find him. Among other important people, King Petar I, laid the cornerstone at the ceremony. I was in the synagogue on Cara Urosa Street twice. I was upstairs on the balcony. I cannot remember the occasion when I was there; it probably was some holiday. My grandmother took us. I don't remember what it looked like inside. I only remember that we were on the balcony. I remember that we once went to a bar mitzvah, but I don't remember whose it was.