Paris for Halloween?

I've been living back in the United States now for about the same about of time I lived in the City of Lights. Lately, something's been provoking my longing more than usual. Maybe it's my unsatiated appetite for wild game? Or the vendange? Or the resplendant autumn farmers' markets? Or the crisp weather, ideal for wandering Paris' streets and parks. Not sure, but 36 Hours in Paris hepped up the longing and made me wonder if trick-or-treating isn't an appropriate excuse for an emergency excursion...