Huge Spider Web – Take one whole corner of the room and use masking tape to make a huge rectangle (or even a pentagon). The web can be made inside the rectangle following the pattern in the picture (just use straight lines to make the lines that meet in the centre). To be scientifically accurate, you can even make the tape face away from you on the lines that meet in the centre. The short lines that go between the lines that meet in the centre can be sticky side out. Place a huge toy spider in the centre of the web.

Note the lines that serve as a frame for the web
Spider and Fly Game – You can do a scaled down version of the above web and make sure to follow the direction about which way the tape faces. It can be placed in a doorway. Kids are given cotton balls which are the flies. The kids have to throw the ‘flies’ through the web. If you want to make it competitive, a person can win all his or her flies make it through the web. Credit goes to Swan Lake Nature Sanctuary for this idea.
Touch Real Webs – Building on the last two ideas, you can have kids touch actual webs and try to notice which strands are sticky and which are not. The spider usually walks on the non sticky strands. Remember to tell kids not to destroy the web as the spider may not have enough protein to make a new one, especially if you remove the web. Some spiders eat the web if it is wrecked so that they can make a new one.
Dry Ice Cloud – If you have someone dressed as a witch, you can make a cauldron of hot water with some plastic insects floating in it. Adding pieces of dry ice will make a huge cloud of fog. Chanting something witchy will add to the effect, of course. Be careful never to touch the dry ice.
Pumpkin effects – 1. Put a cup of warm water inside a pumpkin and occasionally put pieces of dry ice in the cup to have fog come out of the pumpkin. A light will add to the effect.
2. You can put blinking lights inside a pumpkin as well for a different look than usual.
3. Try illuminating the pumpkin with glow sticks for an eerie kind of light.
** Dollar stores have good prices on blinking LEDs and glow sticks.
Moving Ghosts – A small fan can be used to make a ghost move eerily. Obviously, the bigger the ghost, the bigger the fan needed.
Teach about spiders, bats, skeletons, etc. – I don’t think many people do this, but it is great time to simple teach kids some facts about the animals and things associated with Halloween. The more hands-on, the better.
Flapping Flying Bat – Bats that are attached to the ceiling with a string and flap around, flying in a circle are quite cheap and a lot of fun.
Floating Sphere

Some materials for this science activity
Materials: glass jar (sans label), rubbing alcohol (99% is better, 70% works), vegetable oil, food colour, eye dropper, water, pencil, eyedropper (or a spoon)
Procedure: Fill the glass jar half or three quarters full of rubbing alcohol (less if it is 99%). Drop one drop of oil into the mixture. The oil will sink to the bottom. Keep slowly pouring water until the drop of oil is a sphere floating in the centre of the mixture. Now add more oil and use a pencil to bring the drops together to form one giant oil sphere.

Some oil spheres hanging out!
Why is it a sphere? Move it around. Can you change the shape? Why does adding/taking away water make it rise or fall?
Drop a drop or two of food colour onto the oil sphere. Do they mix?

I used dark colours so you can't see the sphere (oops).
Now if you are thinking I am going to answer these questions for you, you’re wrong. Science is about trying stuff and discovering things. Have fun and let me know how it goes.
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