Ya'll have fun. I DON"T DO HALOWEEN. I believe it is from the pits of hell.
We don't celebrate the "meaning" of Halloween, or it's origin. We have a "Harvest Festival" for our kids, and call it such. Carving a Pumpkin is just that....carving a Pumpkin. Roasting Pumpkin seeds, and marshmallows, is just that....roasting Pumpkin seeds, and marshmallows.....oh, and drinking hot chocolate. A family having "together" time.
While our children are discouraged from partaking in the trick or treating, we replace it with the festival just for them, with as much candy and gifts they would receive going door to door. The little ones don't understand the "why" we don't celebrate Halloween, but we can't just take it away, without replacing it with something else (So they don't feel left out). We do it every year.
There's nothing wrong with having a substitute, and making it a tradition, in place of a Holiday you don't approve of. You can make your own traditions. A lot of people don't know the origins of some Holidays. Until they do, coming down on anyone with your own convictions is not good, and puts people on the defensive instantly.