A Share Holder Meeting

On June 27th, more than 900 listed companies held their share holder meetings. Why do they hold the meeting on the same day? They want to protect themselves from a 'soukaiya', which is a share holder related to gangstars. A 'soukaiya'  is searching for scandals about famous companies and intimidates the companies by threatening to leak the scandals at the share holder meetings. If the companies want to keep a secret, the companies have to give in to extortion In order to weaken the power of  'soukaiya',　the day of share holder meetings are concentrated on the same day