Defendants faced up to three years in prison
Yoan de la Cruz broadcast July 11 demonstration on Facebook
Police in May arrested 44 people at Kampala party
Country's Senate will now consider measure
The US is among statement signatories
LGBTQ-inclusive peace agreement took effect in 2016
Fabiano Contarato challenged homophobic comments during hearing
Advocacy group describes decision as a 'landmark judgment'
Congressman Chris Pappas among participants
New government urged to expand LGBTQ rights