Celestia: “I didn’t. Ponies threw a celebration themselves, merged it with their existing harvest festival and it grew and grew each year while I went into seclusion for the day. No pony brought it to my attention either. So I had no idea it wasn’t the harvest festival for about ten years.
 
“I seriously considered banning it but… at the time I had no idea how I could save my sister, if I could ever get her back. If she never returned, I thought it would be better to be misremembered by the masses as a fictitious boogie mare to scare foals than to be remembered as a very real pony who almost brought the world to an end. At least that way, ponies wouldn’t so directly hate her.”