Despite the ban of this weekend's march that has forced Serbia's gay activists to organise the gathering indoors, they have vowed to keep up with preparations for a parade next year.
"The pride parade is not a circus, we are not going to disappear, we will not give up and we will remain visible," said activist Goran Miletic.
Serbian authorities banned the parade on Wednesday, for the second year in a row, citing security threats.
Instead of marching, the activists took to the street only to sit on the pavement outside the hall, waving rainbow flags and holding signs with the date set for the next year's parade, September 28.
"We hope the authorities will have enough time to enable us in a year to walk a 970-step long parade" in Belgrade, Miletic said, alluding to the distance of the planned march.
Dozens of policemen, some of them in riot gear, were positioned near the hall and along the central streets of the Serbian capital.
A police spokeswoman told AFP no incidents were reported during or after the gathering.
For Marin, a 28-year old designer from Belgrade, the gathering was "nice, but sad".
"I can wait another year, and then another, but for how long? I want to be able to live like everyone else, not to wear a mask forever," said Marin, who did not want to reveal his last name, afraid of losing his job.
Gay activist Jelena, who said her family had disowned her after coming out as lesbian, warned that in "highly conservative society like Serbia, the step-by-step approach might be the smartest, but just leads up to frustration."
"I do not want to parade naked with my girlfriend in the street, I just want to be able for us to walk hand in hand," she said, resigned.
Swedish Minister for European Affairs Birgitta Ohlsson who was supposed to join the march, said she was disappointed with the ban, describing it as a "discrimination".
"The European Union will not accept inequality and homophobia," Ohlsson warned.
She called on Serbia, as a EU membership candidate country, to "deliver" in the field of human and minority rights issues and freedom of speech and assembly.
"It is a duty of the Serbian government to fulfil its obligation in the field of human rights," she said.
Serbia became an EU candidate member in March and is hoping to get a date to start accession talks this year.
Serbia's Prime Minister Ivica Dacic said "security information gathered by the police led us to believe there would be bloodshed" on Belgrade streets if the parade was held.
In 2010, Serbia held its first gay pride parade in a decade but violent riots followed. More than 150 people, mostly police officers, were wounded in clashes between security forces and ultra-nationalists and hooligans.
Last year the parade was banned at the last minute by the police due to security concerns as a number of ultra-nationalist groups had announced they planned to disrupt the march.