Havana gathering took place months after anti-government protests
The Olympian went on to tell those in the audience that he was going to make it his mission to effect change
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'