Mississippi school cancels prom rather than allow same-sex couple to attend:

March 2010
On March 10, 2010, the Itawamba Agricultural High School in Fulton, Mississippi cancelled its high school prom after Constance McMillen, an 18-year-old senior, indicated she intended to attend with her girlfriend.
Source: The Clarion-Ledger (Jackson, Miss.), 3/11/2010

 
   
  First gay pride parade in India:

June 29, 2003
On June 29, 2003, 35 men carrying a huge rainbow flag marched through the streets of Calcutta in silence in India's first gay pride parade.
Source: Associated Press, 6/29/2003

 
   
  Punishment for sodomy in Austria until 1852:

Life imprisonment with hard labor
The punishment in Austria for sodomy remained life imprisonment with hard labor until 1852, when a new penal code reduced sentences for men at the same time it criminalized sexual relations between women.
Source: Completely Queer: The Gay and Lesbian Encyclopedia, 1/1/1998

 
   
  Chinese Psychiatric Association removes homosexuality from a list of mental disorders:

April 20, 2001

Source: Boston Globe, 4/29/2001