Drinks: Beer dyed red, orange &/or black (then laugh your head off when they piss). If you can afford it, get dark ale or German beer (celebrate Oktoberfest too). Also, use apple cider &/or punch for those who don't drink or may be designated drivers.
Buy a few pumpkins & have a sex carving contest. You can have one for the guys carving tits & cunts while the gals carve dicks. Have sextoys as the prizes (giant dildo for the gal & penis pump for guy). Alternately, you can have a jack-o-lantern suck-off
Have a condom-blowing contest. The one who blows the most condoms up, wins.
Don't forget the hangover medicine for the day after
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Moongem Erotica