I'll gladly start a poll but I think I'll give this a few more days to see if any other ideas come in to vote on first. I'm even going got go back and look at old threads to check out unused ideas that are still good ones.
What about a Monster-ade? A dress up party but everyone wheres masks and outfits more orentied to monsters. Vampires, Zombies, Werewolves, Ghosts and things of that matter. There could be contests for the most scary looking costume and the most cute looking costume.
My second idea is to have a Samhain festival. (Information below is from Wiki)
Halloween has its origins in the ancient Celtic festival known as Samhain (Irish pronunciation: [ˈsˠaunʲ]; from the Old Irish samain). The festival of Samhain is a celebration of the end of the harvest season in Gaelic culture, and is sometimes regarded as the "Celtic New Year". Traditionally, the festival was a time used by the ancient pagans to take stock of supplies and slaughter livestock for winter stores. The ancient Gaels believed that on October 31, now known as Halloween, the boundary between the alive and the deceased dissolved, and the dead become dangerous for the living by causing problems such as sickness or damaged crops. The festivals would frequently involve bonfires, where the bones of slaughtered livestock were thrown. Costumes and masks were also worn at the festivals in an attempt to mimic the evil spirits or placate them.
What we could do with this one would more be the little fires for putting in treats to ward off spirits, and the masks and costumes to keep the spirits at bay. Anyone who wants to elaborate on this one feel free! lol i dont expect anyone to want to throw little lambs into the fire or anything like that. I just posted up a basic of what the history of the holiday was ment for.
I love the Venetian Masquerade Ball idea! Just 'cause I love the extravagence of it. And it reminds me of the ball room scene in _Labyrinth_.
And the Samhain idea is good too - though, the little fires would need to be adjusted to whatever setting. Such as - maybe little bits of incense to drop into oil over tea-lights in the TMP setting. It would have to be very controlled for fire code.
Of course, as mentioned, the ideas so far can be used in any setting, so, whatever tweeking necessary would be decided after the location.