In childhood, or for family members with small children, it's a kind of party, enjoying eating cakes, KFC(chiken), getting a Christmas present from Santa Clause, or their parents, etc. In adolescence, it's also a kind of party, gathering with friends, enjoying singing at karaoke box(shop), exchanging presents, eating,etc. As for lovers, it's a time they spend their times with each other, over night if they can. What applies for all is nobody celebrates the God or Christ, except for Christians.
So is halloween, which is in part horrible event in Japan, far too different from original one in America.