Spider is an important feature of the myths of the Southwestern nations, I believe.

Pumpkins are associated with Hallowe'en, if I remember aright, because they were available in America and could substitute for the original Jack O'Lanterns, which were carved from hollowed-out turnips (swedes), among other things.

With the Celtic Samhain (probably spelled wrong) being the night when the spirits of the Dead were closest to the Living, folks originally just locked the doors and hoped for the best. Then they got into rites to placate and honor the Dead, the Roman church didn't like it and changed the reason for it, and the next thing you know we have Hallowe'en and all that stuff of today.

Of course, I simplified it a little bit.

I don't think that there is a spider/weaving/women/Wicca connection, but I could, of course, be wrong.

Maybe I'll carve a turnip this year for old times' sake.