Should Christians celebrate Halloween?

Halloween comes from old Celtic tradition from England in which druids celebrated the harvest season by terrorizing local villages looking for human sacrifices for their gods.  Almost every idea of Halloween comes from these times from jack-o-lanterns to trick-or-treating.  None of these things are endorsed by God in the Bible, many of them are condemned.  God does not want us being around witches, sorcerers, or people who claim to talk to the dead (Deuteronomy 18:10-12).  However, we as Christians can use this pagan holiday as a witnessing opportunity to kids who come to our house looking for candy by giving them gospel tracts.  Give a little Jesus at your house no matter what day it is.