Your accreditation decides where you can walk. The Blue Zone is the negotiation space, run under UN rules; the Green Zone is the public side. Both matter, and they run on different clocks.
Practical things first-timers wish they had known: Ulaanbaatar in late August swings from warm afternoons to cold evenings, the days are long, and the queue for coffee is a networking opportunity.
Come with one clear ask, three people you want to meet, and somewhere to write things down. The Hub’s daily debrief is where you turn all of it into something usable.