One of the most poignant and powerful things you can ever do (in my mind) is offer a prayer for the dead. This can be done at any time during the year, but is especially significant at Halloween.
1 white votive candle offering of your choice picture of your loved one
Light a white votive candle. Lay your offering on your ancestral altar, or next to a picture of your special loved one. Hole your hands together in the prayer position. (Note: the prayer position that most of us are familiar with actually has magickal significance. When you hold your hands together, palm to palm, you are creating a flow of circular energy from the right palm, up your left arm, through your heart chakra, and down your right arm into your right palm.) Say:
From the dawn of your birth To the sunset of your death I honor you. From the missions you completed To your duties left undone I honor you. From the seasons of your being Through the cycle of your life I honor you. From your time beyond the veil 'Til your earth entrance back again May the angels support you May spirit surround you May my healing love reach you From this moment until the end of time. So mote it be.