The Clustcwyr Christmas Do (aka Cyngerdd Canol Gaeaf yn Clustcwyr) is an annual event held at the Clustcwyr Studios, usually (but not universally) on 21st December. A headline act (given in bold type here) play a full set, with supporting performances throughout the evening. It's a claustrophobic event with much drinking and nibbles. Some years have been memorable, some are best forgotten. Here are the running orders:
 

Grand Opening: May, 1975	Gorwel Edwards and the Maniacs Metal Headed John Craven
Christmas, 1975	Gorwel Edwards and the Maniacs
Christmas, 1976	Maxwell's Mechanical Monkey Wrench The Seed John Craven & Ike Imeson
The Cookie Crumbs, Live: August, 1977	The Margarets Cathy Carrow and the Cookie Crumbs
Christmas, 1977	Maxwell's Mechanical Monkey Wrench The Margarets The Cookie Crumbs
Noswyliau Nodwydd: August, 1978	Dirywio The Murderous Gorwel Edwards Dirywio
Anhrefn yn Clustcwyr: Christmas, 1978	The Seed The Margarets Dirywio
Christmas, 1979	The Cookie Crumbs John Craven with Ike Imeson
Christmas, 1980	The Margarets The Cookie Crumbs
The Craven Angel Lives!: July, 1981	John Craven and the Angels of Death
Christmas, 1981	The Margarets The Seed
Christmas, 1982	Cathy Carrow The Margarets
Christmas, 1983	Petra & Polawski (DJ-ing with electric noodlings, throughout the night) Helena's Box The Gorwel Edwards Liberation Front
Christmas, 1984	Petra & Polawski (DJ-ing with electric noodlings, throughout the night) Adam Lucas & Jo Hustler Helena's Box
Christmas, 1985	Petra & Polawski (DJ-ing with electric noodlings, throughout the night) The Margarets Helena's Box
Christmas, 1986	Petra & Polawski (DJ-ing with electric noodlings, throughout the night) Helena's Box & The Margarets
Christmas, 1987	The Moisture Farmers Helena's Box
Christmas, 1988	The Moisture Farmers The Angels of Death
Christmas, 1989	Cathy Carrow & The Margarets The Moisture Farmers
Christmas, 1990	The Moisture Farmers The Angels of Death
Christmas, 1991	Rotten Fruit The Moisture Farmers
Christmas, 1992	Cyfeb Cathy Carrow & Julie Mason, with Dafydd Morgan & Tim Gower Rotten Fruit
Christmas, 1993	Rotten Fruit The Moisture Farmers Cyfeb a John Craven
Christmas, 1994	John Craven, with Dafydd Morgan and Chris Holland Rotten Fruit Cyfeb
Christmas, 1995	Helena Jones, with Josh Rose, Daniel Curran and Dafydd Morgan Llefrith
Christmas, 1996	Helena Jones, with Josh Rose, Daniel Curran and Dafydd Morgan Diwylliedig Julie Mason with Josh Rose and Tim Gower
Christmas, 1997	Diwydianfa Rhonwen Stephens
Christmas, 1998	The Science Department (DJ-ing with electric noodlings, throughout the night) Adam Lucas & Jo Hustler Rhonwen Stephens
Christmas, 1999	The Science Department (DJ-ing with electric noodlings, throughout the night) Diwydianfa John Craven and the Science Department
Christmas, 2000	Rhonwen Stephens Mosfet
Vivus: August, 2001	Magenta Moor Et Cetera John Craven & Ike Imeson Adam Lucas & Jo Hustler Et Cetera
In Memorium Cathy Carrow: Christmas, 2001	Mosfet v Autoparp Llefrith Gorwel Edwards & Dafydd Morgan Magenta Moor (originally lined up as headliners) Autoparp (with Julie & Tim Gower) / The Margarets
Christmas, 2002	Autoparp (DJ-ing with electric noodlings, throughout the night) Rhonwen Stephens Llefrith Magenta Moor
Christmas, 2003	Autoparp (DJ-ing with electric noodlings, throughout the night) Llefrith Magenta Moor with John Craven
The Day of the Dafydd: Christmas, 2004	Autoparp v Mosfet (DJ-ing with electric noodlings, throughout the night) Julie & Tim Gower Llefrith Et Zenda Diwydianfa Rhonwen Stephens Helena Jones & John Craven
Christmas, 2005	Autoparp (DJ-ing with electric noodlings, throughout the night) Rhonwen Stephens Et Zenda Llefrith Helena Jones & John Craven
Christmas, 2006	Autoparp (DJ-ing with electric noodlings, throughout the night) Llefrith Et Zenda Rita Fairclough (Effectively a Cookie Crumbs revival consisting of Helena Jones, Llefrith, Autoparp, John Craven, Kelly McEllerhorne and Daniel Curran)
Christmas, 2007 (Cwmanne Tavern)	Helena Jones & John Craven Et Zenda Llefrith's Caroling Lock-In
33 1/3 (reopening): September, 2008	Autoparp (DJ-ing throughout the night) Llefrith Helena Jones & John Craven Et Zenda
Christmas, 2008	Autoparp (DJ-ing throughout the night) Helena Jones & John Craven Et Zenda Chwen Deilwra! Llefrith
Christmas, 2009	Autoparp (DJ-ing throughout the night) Delicious Robot Love Llefrith Et Zenda Helena Jones Rhonwen Stephens
Christmas, 2010	Autoparp (DJ-ing throughout the night) Helena Jones Delicious Robot Love The Pine Apples Llefrith
Christmas, 2011	Autoparp (DJ-ing throughout the night) Eogiaid Chocolate Lab Llefrith
Death of the Craven Angel: Easter, 2012	Autoparp & The Science Dept. (DJ-ing with electric noodlings, throughout the night) Et Zenda / Magenta Moor Jules et Tim Helena Jones, Llefrith, and Autoparp The Angels of Death
Christmas, 2012	Autoparp (DJ-ing throughout the night) Et Zenda Julie & Tim Gower with Helena Jones Llefrith
Christmas, 2013	Autoparp (DJ-ing throughout the night) Et Zenda Relish Julie & Tim Gower with Helena Jones Llefrith
Christmas, 2014	Autoparp (DJ-ing throughout the night) Helena Jones Et Zenda Jules et Tim Rhonwen Stephens Llefrith
Christmas, 2015	Autoparp (DJ-ing throughout the night) Rhonwen Stephens Et Zenda Helena Jones Palas y Cwm Llefrith
Christmas, 2016	Autoparp (DJ-ing with electric noodlings, throughout the night) Jules et Tim Et Zenda Helena's Box Rhonwen Stephens & Autoparp
Christmas, 2017	Autoparp (DJ-ing with electric noodlings, throughout the night) Et Zenda Jules et Tim Helena's Box The Margarets