Nice concept. There's a few issues I see with the event that cause it to drag out a long while that could be avoided.
The 'weapon spawn points' get stuck on hammer/sword at this point; while players should grab them and simply pass through, cycling the available item randomly, currently they cannot pick them up and get blocked by them. This causes players to run out of ammunition (bomb/arrow), which causes them to just have swords and hammers. This is ok in theory, but results in running back and forth with no real boundary hunting for players with a stick to beat them, while they run away. Not so fun.
The vast size of the arena (graal city) is interesting but not entirely a good thing unless the event has a large number of players participating. What immediately struck me is that with every player death, more of the city could catch fire until the last 2-3 players were all forced into a small central area by the flames.
Also, there is no bomb or arrow indicator, which is pretty annoying. Shooting without any idea how much ammunition you have is nerve wracking.