¹The Hallowen Party invitation tradition to which this add-on pays homage is here described:
Late in September or early October, after dark, you'd answer a knock at your door to find a candle burning on your doorstep with an invitation to a Halloween Party. Not only was no one at your door when you answered it, but who invited you and where the party was were mysteries.
Inside your invitation, you'd find riddles, puzzles or clues you'd have no choice but to solve if you wanted to attend the party. If you didn't, you couldn't go! Your success, however, would bring you to a secret summoning location from which your masked host would greet you in silence in mask. You still might not even know yet who your host was who had invited you!
They'd non-verbally swear you to silence with a finger to their lips and guide you in candlelit procession to the haunted halls where the revelry would take place, in silence by candlelight, while they instructed you about superstitions peculiar to Hallow's Eve. For example, if you successfully catch a falling leaf on Halloween, it's an omen of good luck. There are dozens more!
And for all you knew, unless you could make out by size, your masked host was still unbeknownst to you but could be your nextdoor neighbor, boss, secret admirer, or rival. They were awfully trusting not so very long ago.
Another related tradition was that of a Halloween parade in which the participants at a party would parade around the block or the entire neighborhood of the party in costume by candlelight.