i dunno how to explain, but its something like this.....
if u carefully look at zoneagent, each char who enters the Tower will be shift to zone 1 i.e battleserver zone...
its same as we enter arena too....
as u already know if we r in char selection screen, we r in zone 255, account zone....
n by that facts, i believe towerevent was held in battleserver zone n not in zoneserver zone....
(correct me if im wrong)