It seems like you've provided a lengthy list of concerts and performances from various arts organizations across the UK. I'll help you summarize it by extracting the most notable events:
**Classical Music**
* **Simon Rattle and the London Symphony Orchestra's semi-staged Janáček**: February 13-15 at the Barbican, London
* **György Kurtág tribute concerts**: Various dates in February, including a concert at the CBSO Centre in Birmingham and a performance by Thomas Adès with the Hallé on April 1 at the Bridgewater Hall in Manchester
* **Kurtág at 100**: A month-long celebration of the composer's life and work, featuring performances by Víkingur Ólafsson and István Várdai with the Philharmonia
* **Wigmore Hall 125th anniversary festival**: May 25 to June 7, with a star-studded lineup of performers
**Opera**
* **Siegfried**: March 17 to April 6 at the Royal Opera House in London
* **The Flying Dutchman**: Touring from April 16 to May 15, starting at the Wales Millennium Centre
* **Dai Fujikura and Harry Ross's opera about Hokusai**: World premiere on February 12 at Scottish Opera
* **Abel Selaocoe's Mohopolo/Ancestral Memory Weekend**: April 23-26 at Barbican, London
* **Du Yun's Angel's Bone**: May (dates TBC) at Aviva Studios in Manchester
**Concerts and Tours**
* **Metallica**: June 25 at Glasgow Hampden Park
* **Ariana Grande**: August 15 to September 1 at the O2 Arena in London
* **The Rite by Heart with Aurora Orchestra**: April 11 and 16 at Snape Maltings, Aldeburgh
* **Bantu Ensemble's Ancestral Music Festival**: April 23-26 at Barbican, London
**Other**
* **Kurtág at 100** (workshops and events): Various dates in February and March
* **Wigmore Hall 125th anniversary festival** (broadcasts on Radio 3): May 25 to June 7
**Classical Music**
* **Simon Rattle and the London Symphony Orchestra's semi-staged Janáček**: February 13-15 at the Barbican, London
* **György Kurtág tribute concerts**: Various dates in February, including a concert at the CBSO Centre in Birmingham and a performance by Thomas Adès with the Hallé on April 1 at the Bridgewater Hall in Manchester
* **Kurtág at 100**: A month-long celebration of the composer's life and work, featuring performances by Víkingur Ólafsson and István Várdai with the Philharmonia
* **Wigmore Hall 125th anniversary festival**: May 25 to June 7, with a star-studded lineup of performers
**Opera**
* **Siegfried**: March 17 to April 6 at the Royal Opera House in London
* **The Flying Dutchman**: Touring from April 16 to May 15, starting at the Wales Millennium Centre
* **Dai Fujikura and Harry Ross's opera about Hokusai**: World premiere on February 12 at Scottish Opera
* **Abel Selaocoe's Mohopolo/Ancestral Memory Weekend**: April 23-26 at Barbican, London
* **Du Yun's Angel's Bone**: May (dates TBC) at Aviva Studios in Manchester
**Concerts and Tours**
* **Metallica**: June 25 at Glasgow Hampden Park
* **Ariana Grande**: August 15 to September 1 at the O2 Arena in London
* **The Rite by Heart with Aurora Orchestra**: April 11 and 16 at Snape Maltings, Aldeburgh
* **Bantu Ensemble's Ancestral Music Festival**: April 23-26 at Barbican, London
**Other**
* **Kurtág at 100** (workshops and events): Various dates in February and March
* **Wigmore Hall 125th anniversary festival** (broadcasts on Radio 3): May 25 to June 7