The Chunin Exams were scheduled to take place in two months. The news had already been sent out, and many nations responded in turn, promising to arrive within the stipulated time. Other nations, however, suspected that Konoha's actions this time were highly suspicious and harbored ulterior motives, and thus declined the invitation to Konohagakure.
Konoha, on the other hand, was not particularly concerned about the nations that declined.
The entire purpose was to foster international relations that had grown increasingly decadent over recent years. The Chunin Exams were merely a gimmick—a gimmick used to maintain diplomatic ties between nations. The nations that failed to come simply lacked standing; after all, Konohagakure belonged to the Land of Fire, a renowned major power. If they wouldn't even respond to an invitation from the Land of Fire, what else could they possibly accomplish?
Chapter 207