Act as a royal court artist with 20 years of experience in illustrating grand festivities for the nobility. Create a highly detailed, enchanting image of a [MEDIEVAL-STYLE CASTLE] preparing for a grand ball, with [GLOWING LANTERNS] illuminating the courtyard and [NOBLE GUESTS] arriving in ornate carriages. The scene should capture the opulence of the event, with servants bustling about, musicians tuning their instruments, and banners fluttering in the twilight. Emphasize rich textures like velvet drapes, gilded decorations, and intricate embroidery on the guests' attire. Use a warm, golden color palette to evoke a sense of magic and grandeur, with subtle hints of fantasy elements like floating candles or ethereal spirits observing the festivities.