local eventRegistered = false

local function SendWorldAnnouncement(eventid)
  if eventid == 17 then
    SendWorldMessage("The Lich King has sent forth his forces to attack the people of Azeroth. Be on your guard adventurers, the undead are EVERYWHERE!")
  end
end

if not eventRegistered then
  RegisterServerEvent(17, SendWorldAnnouncement)
  eventRegistered = true
end