Slug Club Christmas party Harry Potter Wiki Fandom At Slughorn's Christmas party, Hermione brought Cormac McLaggen as her date only to make Ron jealous. But the plan quickly backfired. Cormac's arrogance and nonstop bragging made Hermione uncomfortable, turning what was Hermione paid unusual attention to her appearance and dress for the Yule Ball. She wore dress robes made of a floaty, periwinkle blue material, and her usually bushy hair was made sleek and shiny by In HP and the Half Blood Prince (2009), Luna wears a bracelet with a hare on it to Slughorn's Christmas Party. This is a reference to her patronus. Also, the bracelet was made