Board Thread:General Discussion/@comment-4830106-20151026041312/@comment-4010415-20151026213108

"As the skills of the Huntsmen grew, so did the games. And in time, it was decided that the tournament would need a stage equal in greatness, to that of its competitors.

Amity Colosseum was the culmination of the four Kingdoms' efforts; a technological marvel and a shining symbol of harmony, capable of making the journey to all the Kingdoms of Remnant."

^ WoR: Vytal Festival Tournament

So, yeah, the tournament did grow through time.