Taliban regained control of Afghanistan last August
Taliban has threatened to execute gay people
Rainbow Railroad part of evacuation effort
Taliban regained control of country on Aug. 15
March 15 attack left gay man dead
Congressman Chris Pappas among participants
Taliban regained control of Afghanistan on Aug. 15
Taliban entered Kabul on Aug. 15
Taliban has said it will execute gay men
HRC president to participate in virtual panel in Canada