Here are a few articles offering some historical background on Halloween, All Saints' and All Souls'.
and then, from Godspy, A unique idea:
Some Catholics in America have reacted against the paganizing trend by abandoning Halloween altogether. Influenced by their Evangelical neighbors, they're giving up on the hard work their ancestors did to harness the coolest parts of paganism and put them to work, and we think that's a shame. Others try to sanitize the day by dressing their kids up as saints and angels. This works pretty well for some of the girls, and the boys under 5, but after that it gets old mighty quick. The only way to keep such a party interesting is to dress the boys as soldier saints, warrior archangels such as St. Michael, or the Angel of Death sent by God throughout the Old Testament to smite the Egyptians. Or else-and here's an idea we're really proud of—to let the kids play out the martyrdom scenes of the early Church, with the more outgoing boys done up as Roman soldiers, lions, and dragons—whose job it is ravage and slaughter the girls, dressed up as virgin martyrs. Get enough Roman helmets, fresh white togas, and fake blood packets, and you can make Halloween mighty interesting to the most jaded American boy. (Get plenty of plastic swords.)
For impressionable adults, however, such doings might come across as kinky. (Do you really want to watch your wife "devoured" by your accountant, dressed as a lion?²) So we'd like to offer our idea for celebrating Halloween which is both spooky and meaningful—and unforgettably delicious. We call it our "Halloween Purgatory Soiree."