Pinkie Pie had promised Ms. Ruby to be at the Yearly Midsummer festival; even when it happens to be at the Crystal Empire this year. The trip caused Pinkie Pie a small problem, but a masquerade solved the problem.
I just recently started to write stories directly towards the FiM actively, though I have been writing for years, publishing numerous stories at Mibba and the eventual pony story, as far as to the MLP