Eastshade

Is the same solution, but in vídeo.

Talk to Ranya at her house.
Wear the coat to walk in the forest at night.
Buy the coat in Nava, it costs 80 Glowstones
Locate the drummers during the night.
Follow the sound of the drums.
As Ranya said, they don't come out every night so you might have to use your tent.
Once you locate them, return to Ranya.
Talk to Leela the in the Library at Nava
You'll find the book you need on shelf C.
Go meet Alejo at midnight near Mudwillow's Mirror.
Paint Alejo a painting of Nava's skyline and return with him back to his home.