When sponsors of Sakata City's annual fireworks festival expressed some doubts about the official attendance numbers released every year by the organizers, it prompted a rethink. Last year, for instance, 410,000 people apparently went along. The organizers conceded that the numbers are no more than a broad estimate. It seems the turnout has usually been calculated by taking the previous year's figure and guessing whether the current year saw a 10-20% increase or decrease from that level. This year, then, the organizers decided to perform an actual count by looking at crowd density. The total this year came in at 198,000, or less than half last year's figure. Even allowing for the effect of the disasters - Sakata is in Yamagata Prefecture - it seems evident that past turnout has been greatly overstated.
Source (Japanese)