Bitterness is an unbecoming trait. Any unstructured group of shareholders can gather together and seek a collective voice or plan of action to put to Directors of an ASX listed (or even a public unlisted) company any time they like, what they actually use to trigger an event (e.g. 249D to call an EGM is but only one example) depends on what and how they approach the matter and how it is presented to the Board of the company.
Not sure who you used to check the facts but essentially The Takeovers Panel has nothing to do with what has been posted in here and besides the small point that the Panel is a sub-set of the ASIC and operates under a provision on the Corporations Act to resolve takeovers that are in dispute. It costs about $5,000 to get the Takeovers Panel to move on a dispute.
The posts in here to date are not in regards a takeover.