April

Derpy and Rainbow Dash was inside the remains of the old towns hall in Ponyville the day before Derpy destroyed it. The towns hall had stood empty for two years, as a new was about to be build. It was the day before Applejack went to the rodeo in Equestria to earn money for a new towns hall. As the hall stood empty that spring day, was many complaining about urban legends and ghosts that ran in and out there. The two pegasus ponies wondered if that was real. So that evening before Applejack went away, to Canterlot, was Rainbow Dash and Derpy inside that hall. But it felt like they was not alone. The two pegasus ponies could not see who it was, but they felt an entity was around somewhere.

"Hey, you have to get out as we are on construction." Rainbow Dash shouted.

But nopony answered Rainbow Dash in the quiet hall. The two pegasus ponies got startled, as things moved by themselves without being touched. Another thing startled them, and it was a very old pony in over hundred years old clothes that went away quickly. The two pegasus ponies saw things that was not exisiting anymore in the hall, and they had flashbacks of ghostly fillies that once lived in Ponyville for many decades ago.

"Whoa, let's get out of here now." Rainbow Dash told Derpy.

The two pegasus ponies then left the haunted towns hall, and waited with fixing the rest later the next day. That same day had Rainbow Dash found out in one of her books that the towns hall once had been a school for many years ago. Ponies had also ran out of that school, while ghostly entities took over that school. The haunted and abandoed school  got then rebuild as a towns hall.