I'm thinking no pps are or have been guiding/scouting people?
Games you can play at home:
Apple bobbing - there's other variations too like bobbing for sweets in a basin of flour or gobstoppers in a load of grapes depending how messy or not you can cope with
Doughnut on a string eating race - ring doughnuts hung on strings and 1 per person and you have to eat as fast as possible - no hands!
Spider drive - dice, paper and pencils, each dice result is a spidery body part, when you throw that number that's the bit you draw, winner is first to draw a complete spider
Pin the head on the zombie - like tail on the donkey but a head, blu tak to stick it on
Halloween story maker - paper and pencils, sit in a circle at table, each person writes
1 intro
2 a scary event
3 a funny event
4 an ending
after each part written fold the top of the sheet over so nobody can read and swap with neighbours usually rotating the sheets in an agreed clockwise or anti clockwise direction
Pumpkin carving/designing competition - if you don't want to do real pumpkins they can draw them and you can have prizes either way
Halloween based quiz with Halloween sweets for prizes - questions can be about anything Halloween related depending on age of participants, superstitions/customs from around the world are generally a popular topic
Scavenger hunt in the house
Adults only
Various drinking games, either watching movies and you have to drink every time a cliche appears/is said, or use the above games but apply drinking penalties to the losers
Trick or treating Isn't possible but you can still have lots of fun.
I'm alone this year so it'll be a glass or 2 of something alcoholic and my favourite scary movies.