I have suggested something very similar myself, and I would love to see it happen. My ideas included a circus/acrobatics skill so you can become a performer on the festival stage - learn juggling, stilt walking, tricks with the giant hula hoop like in Sims 3, fire breathing, etc. Archery and Ax throwing games (maybe an archery set and skill that you can take home, too), fake swords and shields for kids to buy and play with together, new Celtic and medieval-inspired songs to sing for another performer idea, maybe some NPCs to wander around and entertain, and even a the return of the pickpocket/Unscrupulous Charlatan. Medieval costume/CAS assets so our Sims can dress up, including some fantasy costume pieces like wings and horns and satyr legs ... I could go on, but you get the idea.