...trick-or-treating is not some deeply mysterious ancient Catholic mystic rite laden with drama and meaning by which we don costumes to mimic the shades of the Poor Souls in Purgatory as we ring doorbells and beg for prayers and blessings (and some free candy while we're at it).
It is a relatively modern American secular party-custom by which we dress our children up as Spider Man, Sponge Bob, Dora the Explorer, or a Random Disney Princess and send them out to get free candy from the neighbors.
If you do it--hey, enjoy it. Not everything in our lives has to be fraught with Catholic meaning and significance (especially if you have to strain the truth to a ludicrous degree to find that meaning).
If you decide to celebrate the Eve of All Hallows' Day with a party in honor of the saints, instead--hey, enjoy it. There's nothing wrong with adding a little Catholic meaning and significance to our secular parties and celebrations.
But if you start handing me leaflets authored by various Catholic Blogging Experts which argue that really, truly, letting your kid dress up in a Bob the Builder outfit and sending him to get a lot of candy-loot is really a deeply and historically significant Catholic act of the sort which all Catholics under pain of excommunication from the Right Sort of Catholics of the Blogosphere Association must participate in--you're going to get nothing but giggles from me. 'Cause, you know, trick-or-treat may be fun and all that, but it has as much to do with Catholicism as green beer does.
And that, hopefully, will be my last word on the subject.