Classic Christmas music about sleigh bells and Santa fills Mountain America Expo Center in Sandy as lights and baubles shine on over 500 Christmas trees decked out in Barbies, rainbows, military branch flags, Lamborghinis and more. Primary Children's Hospital is hosting its 53rd Festival of Trees, open Tuesday through Saturday. Janet DeWolfe, executive director of Intermountain Foundation at Primary Children's Hospital, said the trees can go for hundreds to thousands of dollars.