The Christening had been done on the chapel on the first floor. Afterwards, most of the floor was opened to their guests: the Long Gallery, the Conservatory, the Great Hall and the Music Room.
The guest list was limited, at least for the Malfoys. They were mourning after all. Still there were his parents' friends (at least the ones his father hadn't testified against), and there were his friends. In a show of good will, his mother had sent an invitation to her sister. Draco didn't know if she was here. That was up to his mother to deal with. He was more interested in watching Potter and Weasley deal with the people.