While her sister deals with the noble families of Canterlot, Luna is often sent to officiate over major events, such as the Rainbow Falls Trader's Exchange.
Rainbow Falls, home of the Equestria Games qualifying round...and the Rainbow Falls Traders Exchange. Gilda and Surprise run into each other months after the epic baked goods fight that threatened to eliminate both their teams from the Games.
After the Traders Exchange closes a lone bat pony glides down towards Rainbow Falls in search of companionship. She finds a filly eager to learn why there must always be a princess at the Traders Exchange, a tale she is happy to share.