Envoy has visited more than 20 countries since April
Advocates protested government officials during opening plenary
Ambassador says violence indicative of country’s challenges
Violence, discrimination, poverty among topics discussed
Randy Berry, gay Peruvian congressman to take part
Detainees sexually assaulted, suffer discrimination
Anti-LGBT violence in country not discussed
Advocates from Latin America, Caribbean testified in D.C.
Lawmakers cite violence, discrimination in three countries
Nelson Arambú was nearly kidnapped last September
