Having realized that the duration of Discord's "reform" may exactly equal his only friend's lifespan, the palace sends Fleur to assist Fluttershy with acquiring a social life and guarantee a next generation to adore. (What could possibly go wrong?)
Having grown tired of seeing ponies worship the very ground that the Princesses walk on, Discord decides that it's high time ponies started worshiping him instead.
Equestria has resources not found in any other dimension, so of course an alcoholic, mean-spirited scientist would get in on that and drag his grandson along for the ride.
I was just walking to the market when Rainbow Dash stopped me and asked if I wanted to go on a picnic with the others. I casually told her that I had Tuesday Tea, and that's when my day spiraled out of control.