Matthew 26-28

I wonder if the room where Jesus and his disciples ate the Passover hosted more than Jesus' group? Surely there were a few large gathering areas around the city. There is nothing to indicate that they dined alone, and equally nothing to say they didn't. I just wonder how many gathering places Jerusalem had. I wonder if there were other Jewish families gathered in the same room with this rabbi and his disciples. If there were did they notice the deviation from the sedar? Did they wonder why Jesus added the extra bread? I'm sure the disciples were equally curious.
Stuart