Anyone could see the significance of this Cosmic Civilization Summit.
This is a turning point in the era!
This summit will determine the trajectory of universal order from now on. Considering the current state of Human Civilization, it's unlikely for a tyrannical dictator to arise. Since the goal is to hold a summit for all civilizations, those participating naturally must have a say and bring forth their opinions. Thus, their attendance is mandatory. For those who choose not to come, they won't even know the decisions made at the summit, and they might unknowingly violate some human taboos in the future.
Who knows—they might end up being represented by someone else or outright annihilated.
