(A requested story idea.) Rarity seeks out Rainbow Dash's help to train for an upcoming rodeo charity event in Ponyville. Rainbow Dash agrees despite her concerns about Rarity's inexperience. She'll be surprised at Rarity's reason.
It is Equestrian tradition that, when a pony is a certain age, they are given a timer that counts down the days until they meet their soulmate. Rarity was very excited the day she got hers. She just hadn't expected it would be counting up.
When the campaign falls completely off the rails, it’s up to Rarity to play the role of Princess Shmarity and save Spiketopia and her friends from the dastardly Squid Wizard.