In the book, The Night Circus, the Wishing Tree is not a pine tree, but the Night Circus themed birthday party will be in December, so a Christmas tree makes sense.
Night Circus wreath:
Reversible tree skirt:
Small pennants banner to use as garland:
Book ornament, moon ornament (made with Crayola Model Magic over a glass ornament), cardboard circus ornament, and little clip-on doves:
Beeswax moon and star ornaments:
Clip-on battery operated candles that each guest can use to make a wish on the wishing tree: