Types of Guild Events: Guild War, Escort Missions, Surprise Attack, and others

Conditions to Join a Guild War: All players have left novice protection period and joined a guild

Conditions to Join an Escort Mission: All players have left novice protection period and joined a guild

Conditions to join Surprise Attack: All players have left novice protection, joined a guild, brought the surprise attack item, and accepted surprise attack task

Conditions to Join Guild Guard: All players have left novice protection period, joined a guild with guild site, and take guard items.