Princess Cadence is hoping to learn more about pony's boundaries and to get some interesting stories to tell the other royals, mostly the latter. To do this she is making all the citizens of Equestria love a single pony for a day, chaos ensues.
I'm the type of person who logs onto Fimfiction on a near daily basis to read stories like a rabid wolf and unintentionally finds themself auto-correcting errors as they read... Glad to meet you!