For a choreographer the moment your work becomes a classic is when the audience tells you that you’re casting it wrong. I’ve seen Matthew Bourne’s Swan Lake more than a dozen times for professional reasons since it first took off from Sadler’s Wells nearly 15 years ago, and it’s not Adam Cooper’s blinding image all those years ago that’s telling me the press night cast last night wasn’t delivering what the work is worth. It's because I have come to own this piece in my own imagination.

Hip hop is the new ballet. Instead of mostly girls in tutus, mostly boys in tracksuits; instead of pointe-shoes, trainers; instead of arabesques and fouettés, handstands and windmills; above all, instead of nice, nasty. The smell on stage is burning rubber from the shoes; the atmosphere is electric; lights fractured; discipline razor-sharp. Some armies and ballet companies would crawl over broken glass to have the ensemble unanimity that’s displayed in Boy Blue’s cracking show Pied Piper at the Barbican.

The well-prepared adult accompanying an under-10 to the Royal Ballet’s Tales of Beatrix Potter will take with them a pillow and a potty, the pillow for themselves, the potty to tuck under the seat for the necessary moment during this 70-minute marathon. Should the Stasi at Bag Search at the Opera House entrance insist on the potty being checked into the cloakroom, the canny adult carries a supersized handkerchief as backup, to stuff into the child’s wailing mouth when - 30 minutes in, with infant acuity - it realises that it has seen the best bits and there are another 40 minutes of these capering costumes to go, while all the adult wants is a bit of shut-eye until the thing is all over and they can get on with Christmas.

It‘s when you see how popstar fame can reach people with more luck than work that Carlos Acosta’s achievement in becoming a truly popular ballet star is underlined. Ballet is just the toughest discipline there is. Great elite artists and great popular artists are generally divided by an insuperable wall; often there’s a sell-out of some kind when the great elite artist achieves wider popularity, the dancer gets cocky or vulgar or goes on too long. But I have to exempt Acosta from that.

If Margot Fonteyn and Rudy Nureyev were the most massively important people who ever existed in ballet, then the most massively important question that ever existed in ballet was, did they sleep together? Last night Margot got this over pleasingly quickly. There was the quivery BBC anno at the start that there would be scenes “of a sexual nature”, and hop-skip-jump the couple were at it like rabbits straight after their first performance together.

Peter Wright’s superlative production of The Nutcracker has returned to Birmingham Royal Ballet's repertory for Christmas, a production he created for the company in 1990 and to my mind superior to any other presented in the UK today. Magic, the awesomeness of the Tchaikovsky score, are realised upon the stage and shown in its dances with a childlike sense of fantasy. The Christmas tree rises, the rats play, the snow-goose flies - and the audience gasps.

Akram Khan and Nitin Sawhney are too famous to need defining in terms of racial culture, and yet they make a lot of it in the spiel about their offering Confluence, closing the two-week Svapnagata festival at Sadler’s Wells this weekend. When both of them last night were using their contemporary and classical roots with such unselfconscious richness, it was a jolt to read programme notes ponderously attacking “purists” as if the music and dance world were full of Nick Griffins burning to send them home somewhere.

What do you call a dancer with a fractured shoulder and only half a show to offer, who nevertheless takes you to the outer reaches of dance nirvana? It can only be Akram Khan. Now fêted as a (reasonable) contemporary choreographer, the favourite of Kylie, Juliette Binoche, Sylvie Guillem, Khan is too little celebrated for what he does at a level beyond anything most of us are ever likely to see, which is dancing in his magnificent, complex, disturbing traditional Indian form of Kathak.

Lush, romantic storyballets are as scarce as hens' teeth these days, despite the longing of much of the ballet audience to see them. Not because they're too elementary for today's dancemakers, I'd guess, but because to make one with lively dancing characters (male, female, young, old, good, bad, rich, poor), with a flowing story, lashings of set opportunities and an atmospheric score, takes multiple theatre skills few choreographers now develop. David Bintley's Cyrano is one of these rare birds, a truly skilled family ballet with all of the above.

There are horrors in the world so vile that few of us want to think about them. None more so than such cases as Josef Fritzl - or Jaycee Lee Dugard, or Arcedio Alvarez, or Raymond Gouardo, or Wolfgang Priklopil, or Marc Dutroux... but you get the picture. Cases where men abduct girls and turn them into sex slaves and father multiple children by them, often incestuously, hiding them in garages, basements, behind walls, sometimes for decades undiscovered, sometimes murdering them. Mostly you read that it happened, you shudder, and try not to think more about it.