The event is designed to encourage fans to play together as part of an active guild. The description might be a bit confusing, so here's how it works: between now and May 14th, guilds will be ranked according to member levels. Your guild must have at least 40 members, and overall member levels need to total at least 1,000 to qualify. The event includes a screenshot contest for special in-game titles as well.
IGG has set up a ranking board, and every Friday it will be refreshed to reflect the current top guilds according to each guild's total member level. Check out the ranking board page for all the details, and then rally your guild and get to playing! Good luck to all!