As a rule, Salazar Slytherin does not attend parties in honor of (or really, attended by) small children.

Then again, he's Slytherin, so what patience does he have for rules?

His satin over-robe (dark green) is clasped at the throat by a snake of tarnished sterling silver and his hood is lined with silver satin. His boots, long belt and the detailing on his dress robe are made of brown snake skin. He stops to pull off his black leather gloves, placing them in a deep pocket of his velvet emerald green dress robes (with high collar and black buttons) and taps the presents again with his wand to levitate them and allow them to float alongside him as he walks.

He carefully studies each small person to discern for himself who Ingress is.