During my trip 2 weeks ago, the story telling was at 7:30 PM. However, it wasn't in the lobby. It was at the firepit on the path leading to the Arusha Savannah viewing area. (i.e. the firepit outside the doors that are across the lobby from the main entrance)
Some are at the fire pit outside, sometimes at the inside firepit, and sometimes in the little sitting area to the left of the main stair directly across the lobby from the indoor firepit.