The first convention was held in Tulsa, Oklahoma in 1947 for quartets – two years after the foundation of the first Sweet Adelines Inc. chapter in the city. The competition was expanded to include choruses in 1973 and in 2000 the Harmony Classic competition for small and medium-sized choruses was introduced. Originally, Harmony Classic was held independently but since 2009 all three are now hosted together and run over the course of the convention week. A fourth event, the "Rising Star" competition, was introduced in 1999 for quartets whose members are under-25 years old. It was also held as part of convention from 2009 until 2012 but due to scheduling and cost constraints is now held independently again. Many non-competitive performances are also held during convention week, including by