No,

All Hallows Day (Nov. 1st) comes after Hallow's eve (Oct. 31st).
Nothing in the Wikipedia article supports your claims.
"Respected" is a bold statement. Lets just say that most Christians don't give a lot of religious / anti-religious meaning to it. it's for the kids to have fun.

I don't mind how things go in the IT room, but once your'e out of it and deal with users and customer support, only one rule: BE NICE!

OK, I can picture a game creator of a war/frag/heavely armed game inviting those reseachers for a focus group session and watch his new realease in action were all protagonists are made of females, Hispanics, Native Americans, children and the elderly.

After the carnage, he turns on the lights and faces his audience with a large smile: "Well, whadyall think ?"

1/3 are speechless, 1/3 fainted, and rest are still fighting over the waste basket to belch in it.

Maybe it's an old story but I found this site that uses the same technique:
http://www.schillmania.com/random/humour/web20awareness/

Rehired ? Sounds like the company had more problems than poor judgment, it also lacked a backbone.
I would have fired the manager and press charges against the tech.