Bruce was actually there! And on time! He wasn't sure about this surprise party idea. If it were for him, he would have hated it. But Dick was not him, however similar, had never been him. They were very different, and as far as Bruce was concerned, that was probably a good thing. Dick deserved far better things in life, and maybe surprise parties were one of them.
So he was there, and he even said the obligatory greeting of 'surprise' when the birthday boy came through the door, then moved forward to give his eldest a handshake and a one-armed hug.
"Glad you could make it," Bruce said quietly. "Hope this isn't too much."