Molest Fest is a holiday observed in Equestria where ponies cosplay to mimic Princess Molestia/Luna's 'awkward ways' and leave candies to distract her from entering the town. Alongside the ritual, ponies also held games like bobbing for apples/peaches and throwing spiders back to their nest. The holiday was originally created because nopony was able to bear interacting with the awkward Princess Molestia.
In Episode 6, Princess Molestia gave her Princess of the Night title to Twilight Sparkle after she helped her becoming more sexy and friendly during the Molest Fest. In her letter to Princess Celestia at the end of the episode, Twilight Sparkle mentioned that it was the 'most touching Molest Fest ever'.