From A Wiki of Ice and Fire
The pit's entrance are the gates of fate where two bronze statues of warriors one on either side form an archway into the fighting pit one wields an axe, one a sword and they are locked in mortal combat. On the bricks near the entrance are engraved the names of all the gladiators who ever died in the arena. The pit is made of multi colored bricks. The circular arena is made up of descending tiers of benches each in a different color. The colors are:
The bottom tiers, the red and orange, are for the highest ranking of Meereen. The black and purple benches the highest from the arena are for the lowest of Meereen, usually slaves or the poorer Meereenese citizens.
A Storm of Swords
A Dance with Dragons
In celebration of the Marriage between Daenerys and Hizdahr zo Loraq and peace between Yunkai and Meereen the fighting pit is reopened, several fights and spectacles take place in the pit but the noise and smell of blood draws Drogon to the pit.
|“||And I saw that dragon ripping off arms and legs, tearing men in half, burning them down to ash and bones. People started running, trying to get out of that pit, but I come to see a show, and by all of gods of Ghis, I saw one. I was up in the purple, so I didn’t think the dragon was like to trouble me. ||”|