The brackets around {150} are ambiguous, almost apologetic. The 150th anniversary of Y Wladfa (The Colony), the semi-legendary "oasis of Welshness" in the Patagonian wilderness has given occasion in Wales for the celebration of a most unlikely story. One hundred and fifty men, women and children left their homes all over Wales and created a new life for themselves, against all the odds, at the other end of the world. Sixty-six came from the villages around Aberdare and Mountain Ash in a valley 15 miles north of Cardiff.

Punchdrunk entered the world of theatre through a side door in the basement. The company navigated a strange path around abandoned warehouses on the edge of town, via the odd wrong turn and sundry culs de sac, and fetched up two years ago at an old Royal Mail sorting office next to Paddington station. It was here that they performed The Drowned Man: A Hollywood Fable.

Enzo Green, Shirim, Raethro Red, Raemar Magenta. Everything has a name. But beyond the meaningless but musical sounds of their titles, the light projections and installations on view at Houghton Hall by the leading American light, land and skyscape artist James Turrell are an ineffable art whose presence and effect is subtle, substantial, utterly memorable and almost beyond words.  

The Langham has marked its 150^th anniversary in theatrical fashion by commissioning an original drama spanning several decades – and floors – from emerging company Defibrillator, whose Tennessee Williams trio at this venue impressed last year. Now Ben Ellis checks in with a tailored play that gains substance the further it reaches into the past.

Mametz Wood was the objective of the 38th Welsh Division during the First Battle of the Somme in World War One. Numerous failed attempts to capture the wood were made, during which much Welsh blood was spilt. Mametz therefore holds a great deal of significance for the Welsh and their contribution to the First World War.

The question about Harrison Birtwistle’s Down by the Greenwood Side is: what is it? Designated by the composer as a “dramatic pastoral”, which is not very enlightening, it is not really an opera, nor a play with music, nor a piece of performance art, but somehow a winning combination of all three.

Dylan Thomas’ iconic play Under Milk Wood boasts a host of colourful characters. From the blind sea Captain Cat to the loveable Polly Garter washing the steps of the welfare hall, the play is a play for voices; a play for characters. Thomas, born in Swansea, thirst like a dredger, moved to Laugharne with his wife Caitlin in 1938. It was here he most likely got the inspiration for those characters, although the setting was allegedly inspired by New Quay in Ceredigion.

Cardiff Bay’s Bute Street is home to many imposing buildings, a large number of which are derelict. They have the potential to become something more than they currently are. They can be revived, and that’s what Louise Osborn has done by mounting her site-specific production to one of them. Roar Ensemble and Sherman Cymru have brought Maudie’s Rooms back to an old customs and immigration house in Cardiff after sell-out performances last year.

The idea for Day to Go – the show takes its name from a bus ticket – sprang from my own bus journeys around Barry and from a desire to make a piece of theatre specific and relevant to the town. I persuaded a local company to lend me a bus for a few days so I could start to plan the route and, at the same time, I began a series of conversations with bus drivers, bus users, café owners, choir leaders, librarians, hairdressers and even the local undertakers in a bid to find out what matters most to people in Barry.

It won’t have escaped the attention of anyone with an ear for poetry that Dylan Thomas turns 100 this year. He was born in a suburban house on a hill overlooking Swansea Bay a few months after the outbreak of war, and by his early 20s had been hailed a significant poetic voice by TS Eliot. By 39 he was dead, hastened to his grave by a lethal combination of alcohol, pneumonia and New York doctors.