I'm a mom-in-waiting, not yet a mom... so I haven't yet had to deal with this.
But right now both my husband and I are in agreement that Halloween is fine and I plan to have fun making my kids' costumes. We also celebrate Valentine's between ourselves but when it comes to the kids going to school I think we may be cautious about things if our children are in mixed-gender classes and the teachers have the kids exchange valentine cards.
As for Christmas, my family is Christian and we both want the kids to be able to experience family celebrations on both sides. It's not as much of a dilemma in our case because my family's observance of Christmas is cultural but not religious, so there won't be any staying home from midnight Mass or any of that while the rest of the family goes out. I think we agree that if we give our children a strong Islamic education and observance in our own home, they will mature to understand the distinction between sharing a happy occasion with people we love and believing everything they believe.
Nice sensible post. I used to go trick or treating when I was little, and I will take my kids as well once they are older. I think it's just a fun day to dress up, go out and have some fun, esp the candy deal is nice. We always have candy and hand out happily for so many years, that and the fact that we live right on the corner of a busy street, so ours is one of the 1st homes the neighborhood kids come too. Valentines is not a big deal, neither is X-mas, but office wise etc, i celebrate all holidays with others. It's nice to make kids aware of all holidays so they understand others as well.