Final answer:
The festival called Vanity Fair is where Christian and Faithful are imprisoned in John Bunyan's 'The Pilgrim's Progress'. It symbolizes worldly temptations and critiques materialism and worldly pleasures.
Step-by-step explanation:
The festival in which Christian and Faithful are imprisoned is called Vanity Fair. This occurs in John Bunyan's classic work, The Pilgrim's Progress, which is an allegorical tale of Christian's journey to the Celestial City. The name Vanity Fair represents the worldly temptations and distractions that Christians may face on their spiritual journey. The fair is depicted as a place where all sorts of goods are sold, such as houses, lands, trades, places, honors, preferments, titles, countries, kingdoms, lusts, pleasures, and delights of all sorts. It is a symbol of human vanity and is meant to critique the materialism and temptation of Bunyan's time, which is still relevant today.