As of November 2006 the Magical Fireworks Voyage was available for GG but only a select nights. Since there isn't a full meal served, only dessert and snacks, if I remember, you paid OOP. We did the Safari Celebration and loved it. It was a table service dinner--excellent btw--and was 2ts credits. I suggest calling the GG number for more information and nights the voyage is offered during your stay.
Have a great trip.