Matthew Bourne regularly revamps the first version of a new piece so that by the second go-round it really zings. For the return of his 2019 Romeo + Juliet, though, very little has changed, yet it feels refreshed.

Every time you see Jewels, George Balanchine’s masterpiece from 1967, something new emerges from its treasure trove. What the Australian Ballet pleasurably bring to the fore is its playful, and play-acting, side.

On the day Mick Jagger turned 80, that spring chicken Carlos Acosta, 50 this year, returned to the stage of the Royal Opera House, which he had left in 2015 after 17 years. Carlos at 50 was a wonderfully sunny, warm embrace of a return: the audience greeted his first appearance ecstatically, and his wide grin reflected how happy he was to be there too.

Came for the music, returned for the theatre. I oversimplify: Riccardo Muti’s Roads of Friendship events, meetings of his Luigi Cherubini Youth Orchestra with players from other places – since 1997, they have included Sarajevo, Lebanon, Kenya, Iran and this year Jordan – will always be the big cornerstones of the Ravenna Festival.

When flamenco first came out of the shadows and started to fill big theatres, it was like something out of a historical pageant. The shows that played London in the early 1990s harked back to an imagined gypsy past where old men hammered rhythms on blacksmiths’ anvils and women swirled extravagant frills. The crudely amplified music lost much of its detail but audiences lapped it up anyway.

Is it a cop-out for an artist to label a piece of work “Untitled”? Painters and sculptors make a habit of it, reasoning that they want to leave the viewer free to bring to the experience what they will, unhampered and unlimited by prior information. Odd, then, that dance, being such an ambiguous, free-associating art form, should be so far behind the curve.

Innovation is always a risky business. Opera North’s vision and ambition for this production is to create, in effect, a new genre: a combination of staged choral-orchestral performance with contemporary dance.

Partnership and diversity are the buzz words – good ones, too – and the concept brings together the opera company’s soloists, chorus and orchestra with dancers from both Leeds-based Phoenix Dance Theatre and South Africa’s Jazzart Dance Theatre, plus some help from Capetown Opera.

The timing was impeccable, though almost certainly accidental. As protesters lay prostrate in The Mall in a mass “die-in” on the day designated as Earth Day, and as many thousands more urged action against climate change outside the Houses of Parliament, Nederlands Dans Theater was giving its final London performance of a powerful new ballet called Figures in Extinction [1.0].

Akram Khan Company promises “a magical dance-theatre retelling of Kipling’s classic”, and that’s more or less what you get. The choreography is striking and inventive, the dancing and staging superb.

The urge to redesign a heritage ballet is a curious one, given not just the expense but the fact that the main draw of an old ballet is the steps and the music, which stay the same whatever the stage dressing.