I got this today, at least i'm on the waiting list.
Dear August Perrin,
Thank you for your submission, ' Pony Cosplay Chess', for BronyCon 2017. Regrettably, at this time, we are unable to accept your submission but are able to offer you a slot on the wait list.
Every year we receive hundreds of panel and activity submissions and we only have a limited amount of time slots to fill. This leads to us being unable to accept all the events that are qualified. If you would like to remain on the wait list please respond to this email stating so and we will be contacting you with further questions. Thank you for taking the time to submit.
We hope to see you at BronyCon 2017!