The CW has released an official description for the Thursday, November 23 episode of Arrow.
The title of the episode is “Thanksgiving” and you can find the description below.
OLIVER AND FELICITY CELEBRATE THANKSGIVING WITH WILLIAM — Oliver (Stephen Amell) celebrates Thanksgiving with his family but the happy moment is interrupted. Meanwhile, Black Siren (Katie Cassidy) returns to wreak havoc on the holiday. Gord Verheul directed the episode written by Wendy Mericle & Speed Weed (#607). Original airdate 11/23/2017.