Thousands participated in Belgrade Pride in Serbia on Sept. 7
A group of Albanian activists attacked after event
Country's president on Tuesday announced march is banned
Organizers say the event will take place as scheduled
EuroPride fundraiser has raised more than $17,000
Ultranationalist presidential candidate accused of leading attack
The video was created by the Vienna Tourist Board for EuroPride
Thousands celebrate in Brazil and Israel, while Russians face arrest
