Dozens of heads of states are expected to descend upon the UN headquarters in New York for the annual General Assembly. The high-level General Debate starts on September 21 and lasts until September 27. Although the event was held almost entirely virtually last year because of the pandemic, many leaders will deliver in-person speeches at this year's summit, including US President Joe Biden, who will make his first address to the 193-member world body since he took office.