Is it a “special” convention or an “international” convention in Zagreb? Because they are classed as two different things, as explained in a recent video.
Special conventions: happen every year in around 15 locations worldwide and have slightly bigger venues than regular conventions, 10-20,000 in attendance, including 2-3000 foreign delegates from around the world
International conventions: happen every 5 years, with 20,000+ (or 30-40,000, visual and scripts differ) in attendance, 5000 delegates from around the world
It’s not explained in the video whether “special” as well as international conventions regularly have GB members in attendance, which is perhaps the most relevant factor for making is a big deal or not.
https://www.jw.org/en/library/videos/#en/mediaitems/SeriesOrgAccomplishments/pub-com-rep23_5_VIDEO