Dear Discord:
You are not allowed to hold any of your wrestling matches at the same time as the Summer Sun Celebration. They would distract from our own event.
Sincerely, Princess Celestia.
Dear Princess Celestia:
Why do you care if a few ponies don't attend? Especially since I recall you and your student referring to them as “mud ponies” and other such variations. Plus, the non-ponies need something to entertain themselves with.
Love, Discord, EWE General Manager.
Dear Discord:
Thanks for the invite. I'll be glad to go see your show, although I'd probably be happier if they could feature having ponies dropped into a pit and struggling to escape from an ursa minor or something.
Sincerely, Spike.
Dear Spike:
I could probably think of something.
Love, Discord.