In normal circumstances, an interspecies meeting wouldn't take long to arrange and host. The regulated universe's political situation couldn't have been better for those purposes, either. After all, various species were already in one place or in contact with each other.
However, the meeting Khan had called for was anything but normal. It wasn't for ordinary warriors to attend. He needed evolved entities who could understand his language and the threat's nature, and they took time to mobilize.
Getting Thilku representatives wouldn't be a problem, or rather, they featured a different kind of headache. Khan already had the best possible envoys waiting in orbit, but his brain hurt when he thought about hosting an interspecies meeting with them.
Human evolved warriors would be easy to gather, too. That was Earth in the end. The Global Army was bound to have someone decent enough to represent humankind lying around.
