The Millennium Celebration at Federation Headquarters
The Millennium Celebration was an event held by the United Federation of Planets in 3191 to commemorate the thousandth anniversary of its founding in 2161, "give or take a few decades" due to the Burn. The official cocktail for the occasion was Tonic 2161.
Federation Headquarters hosted a gathering for the Celebration, attended by dignitaries including Federation President Laira Rillak, President of Ni'Var T'Rina, and the past and present crew of the USS Discovery. (DIS: "Red Directive")