Activists have criticized public officials over hate speech
Authorities say Jesús Ociel Baena showed signs they were stabbed
LGBTQ+ Victory Institute co-organized 3-day event
Country's Supreme Court in 2015 ruled legal bans 'discriminatory'
Nearly 30 percent of country's community members have considered suicide
Delegation traveled to Mexican border city on May 6
Measure overwhelmingly passed in Mexico state's Congress on April 21
