Twilight Sparkle and her friends are summon to Canterlot Castle by the princess to take part in a mysterious event that the royal sisters are hosting. What they find, however, is something none of them could have expected, even the well-read unicorn. In the end they might just leave a little about the princesses themsevles, as well.
You get my upvote and favorite out of shear curiosity. Can't wait to read more.
I think that you mean to say invite; also the title of the chapter should be the invitation