What about a Capture/Defend event system?

GvG bands (like Ladder):

• There are bands like Ladder system, but there arent top3 only the holder. Each guild can hold x amount of bands according to its upgrades (new guild upgrade);
• It doesnt need opt-in. To join the GvG event the guild need to initiate to select a band, setup def/atk teams and initiate a conflict against the holder
• There are an attacking and defending team. They will capture/defend the band (earn medals for this). 
• Guilds have to capture and secure the bands weekly. To capture the band, the guild must start a 100 hit conflict against the holder. Use the actual akk system;
• After a week the GvG ends and the rewards are given to the players
• Rewads may be OP buffs (cant be leeched or spell broke) and items and they must be bound, or may be an op item that has time durability (7d or so)

I would call these bands by "Castles" to be more cool lol

These are my 2 cents for this topic. What do you guys think?