MPs last month passed Anti-Homosexuality Act
U.S. Rep. Robert Garcia (D-Calif.) among measure's sponsors
U.S. Ambassador to the U.N. Linda Thomas-Greenfield chaired Monday meeting
Activists from Colombia, Afghanistan expected to speak at March 20 gathering
D.C. to host next biennial event in 2025
Country's revised Criminal Code will take effect in three years
Prominent Islamic group criticized Jessica Stern's planned visit
Intersex activist describes appointment as 'milestone'
President stressed 'fundamental freedoms' at risk around the world
Gathering took place on eve of U.N. General Assembly
