Diversity, and the need for more of it, is a hot potato in the theatre arts. Kudos, then, to English National Ballet and its director Tamara Rojo for the 23 nationalities represented within its ranks. And for the poster advertising the company’s current revival of Swan Lake which pictures African-American first artist Precious Adams in swan queen pose. But hold the applause for a moment.

The Matthew Bourne Swan Lake has become a classic. And – lest that word conjure up dusty tomes and a niggling sense of obligation – this is definitively not the old-but-worthy, improving-but-dull kind of classic.

Once a year is never too often to revisit one of the most perfect of all orchestral scores (not just for the ballet), a climactic Russian Imperial Pas de deux and the old-fashioned magic of illusionist painted flats flying in and out across a production/choreography that manages to crack the soft nut of a fantastical story only a quarter told. It all adds up in Peter Wright's Royal Ballet Nutcracker.

Pity fatigue is a risk for any artwork marking the anniversary of the 1918 Armistice. There can’t have been a man or woman in the Royal Opera House on Tuesday night who hadn’t already read, watched, or otherwise had their fill of the horrors of the Western Front and the never-ending debate over the futility of it all.

When Tamara Rojo won the top job at English National Ballet in 2012, it looked like a poisoned chalice. Directors had come and gone, some of them with visionary ideas, but all were defeated by the company’s peculiar position as underdog to the company at Covent Garden.

A new Swan Lake at the Royal Ballet is a once-in-a-generation event.

Everyone knows that Elizabeth I was a monarch of deep intelligence and sharp wit. Fewer know how good she was at the galliard. This was a virile, proud, demandingly athletic dance, usually performed by the men at courtly gatherings, and the fact that the Queen of England so enthusiastically flouted convention in this way says a lot about her.

You have to hand it to the Americans: they think big. Where the Royal Ballet or ENB might put on three or four new works in the course of a season – because commissions are wildly expensive and a box office risk – San Francisco Ballet has just presented a dozen in the space of two weeks. What’s more, the 12 invited choreographers – four of them Brits or British trained – were given virtually carte blanche to create whatever they liked.

Whatever you do in the next couple of days, be sure to grab a ticket for this wonderfully atmospheric production. A glorious fusion of athletic dance, creative visuals and intoxicating sound, the piece pays tribute to the island of Taiwan, named Formosa ("beautiful") by Portuguese sailors in the 16th century, and home to Cloud Gate Dance Theatre.

There is a sense of loyalty from the Brighton audience awaiting Hofesh Shechter’s new work.