Senior Night is a well-established senior tradition, and perhaps one of the most successful. It's basically an excuse for seniors to start their drinking on Wednesday nights, instead of waiting until the customary Thursday like everyone else. Seniors gather at Havana Central and Village Pourhouse for drinks, and there are usually drink specials or door prizes of some sort.
Officially, it is not a Columbia-organized event; it claims to be organized by the Senior Underground. Theories abound as to the identity of the Senior Underground, but remain as-of-yet unresolved. It's probably CCSC and ESC.
During the 2013 fall season, due to lack of attendance, Havana did not want Senior Night on their premises anymore. Thus, a majority of the fall 2013 Senior Nights occurred at Village Pourhouse, causing even fewer seniors to attend. Happily, at the start of the spring 2014, Senior Nights were returned to Havana.