Encountered: Chapter Eleven - at the school.

As Aislinn meets Keenan when he is first joining her school, she notices one of the rowan-men. It is unknown if he is encountered again, or even if he is Evan or Skelley; he isn't mentioned again with any sense of familiarity:

'She stood there, trying not to bolt, refusing to look at Keenan - even though he watched her expectantly - while several more faeries walked up behind Father Myers.
One of the ones whose skin looked like bark - crackled and greyish - caught Keenan's gaze. He gestured at the others who were fanned out at the entrance and said, "All clear."
"Miss Foy? Aislinn?" Father Myers cleared his throat.
She looked away from the retinue of faeries that had invaded Bishop O'Connell. "I'm sorry, Father. What?"' (pg113)