6 ppl in each guild (team). 7 guilds on each alliance, for 6 original keeps and 1 town. NPCs and siege weapons are strengthen to appropriate difficulty.

At first each guild is spawn at their keep/town. They are free to plan their strategy however they want, but losing their own keep will make the guild members unable to respawn even if the keep is retake later, while town guild can no longer respawn after losing the town, they can respawn if the town is retaken.

For first section three alliance must combat in the cyrodii area, until:
1.One alliance reach emperorship, which emp statue will be carried into later sections, giving large bonus to the team
2.Times up, move to second part.

There is no gap between two sections (or a gap where nobody can move, players get to rest a bit). When first section times out, all remaining players who still alive at the time need to move to imperial city sewer, and cyrodii no longer has any effect on the tournament (tho emp/keep/scroll/resource buffs still applies in all pvp area). In the sewer, players will get negative debuffs and can only be cleared if they reach the center of sewer--- where molag bal (and other alliance players) is. The longer they choose to stay in the sewer but not going to the center, the more debuff they get until become completely incompetent.

When 50% of remaining players reach the center, molag bal will spawn with adjusted stats. Players will have to kill off both molag bal and try to survive the attack from both daedra and other alliances. The first 12 players get credit for killing molag bal will get a special buff drop (like skull drop in festival), which can be used on themselves or teammates to give them extra buff.

Third section starts when molag bal is dead, and all players that are dead and not revived by their teammates when the section starts, will no longer continue the fight.
Third and final part is simple---get up to the surface and claim the imperial city.
Each alliance start with 2 sections occupied, and the rest of players try to get all sections under their control, the one who does win the game.
(There should be a timer where when that times up no more players can be revive from the ground, then it becomes deathmatch)

This is inspired by me try to see if WOW worth playing..then I see their BG pvp tournament, which to me, is super boring. So I think, ESO has this strategic pvp that need attention (and with attention I believe it will be improved) and has great potential, a pvp tournament involve 6*7*3=126 players participate with strategic thinking surely will attract many eyeballs and promote&benefir the game, so why not?