For starters, you should snub a few key people. Or send them a follow-up invitation with a wrong address on the other side of town.
Then when they finally do show up, they should throw a--traditionally a golden apple, but any type of solid metal object that can be held in the hand will do, through the glass window, and START A WAR [also make sure to GO TO THE STORE to stock up on FIRE]
In fact maybe better if it's not a golden apple, otherwise they'll suspect you immediately.