Ambroise Thomas’s version of Hamlet is the flagship production of this year’s Buxton International Festival and was always going to be a considerable challenge. How to re-imagine what is admittedly a very 19^th century, very French Romantic re-imagining of Shakespeare for the intimate setting of Buxton Opera House and the necessarily limited resources of a summer festival?

From the animatronic cat on the bar of the Garter Inn to the rowers’ crew who haul their craft across the stage and the military ranks of “Dig for Victory” cabbages arrayed in Ford’s garden, all the period flourishes that helped make Richard Jones’s Falstaff such an audience hit twice before at Glyndebourne look as spruce and smart as ever in this revival.

A Salome without the head of John the Baptist is nothing new: several directors have perversely decided they could do without in recent productions. In concert, the illusion needs the charismatic force of a great soprano and conductor. We got that at the Proms 11 years ago with Nina Stemme and Donald Runnicles. Now Asmik Grigorian, even more the ideal as the obsessive teenage princess, crowns the end of a season that has been a total triumph for Pappano and his London Symphony Orchestra.

Poor, slightly silly Semele fries at the sight of lover Jupiter casting off his mortal form, but in Congreve’s and Handel’s supposedly happy ending, everyone else rejoices that Bacchus is the offspring of this dalliance. Or do they? Not in the new production by Royal Opera supremo Oliver Mears, who’s always favoured the dark side. As in trendy dramas like TV’s Kaos, the gods are the callous rich, mortals their plaything servants.

Over 100 years ago, John Christie envisaged Wagner’s Parsifal with limited forces in the Organ Room at Glyndebourne. He would have been amazed to see it arrive on the main stage this year. But émigrés Carl Ebert and Fritz Busch persuaded him that Mozart was the real country-house ideal. Le nozze di Figaro remains Glyndebourne’s perfect opera, and Mariame Clément’s new production, launched last night with the 588th performance here, keeps it real.

Sometimes, as the first act of Beethoven’s Fidelio closes, the chorus of prisoners discreetly fade away backstage as their brief taste of liberty ends. At Garsington Opera, in Jamie Manton’s revival of a production by John Cox, they slowly descended, one by one, through a circular trap at the front of the stage. We see and hear freedom’s loss, person by person, step by agonising step.

Opera can take many forms and fulfil many purposes: this chamber opera by Zakiya Leeming and Sam Redway is about vaccination. Based on history, it has a story to tell and lessons to teach.

Tchaikovsky has precisely two operas in the standard repertoire (including The Queen of Spades, currently playing at Garsington), and readers who love those works might well be forgiven for wondering what happened to the other eight or nine. On the evidence of Grange Park’s Mazeppa, the answer might seem to be pure mischance.

This thrilling production of Saul takes Handel’s dramatisation of the Bible’s first Book of Samuel and paints it in pictures ranging from grotesque exuberance to monochromatic expressionism. From the earliest flamboyant images, dominated by the disquieting presence of Goliath’s decapitated head, to an encounter with the Witch of Endor that has the starkness of Beckett, this tale of jealousy and betrayal grips you to the bitter end.

Marianne Moore once famously defined poems as “imaginary gardens with real toads in them”. Operas also fill, or anyway should fill, their artificial horticulture with genuine beasts – and flowers. And no work demands the population of a fanciful landscape with authentic passion more urgently than Così fan tutte. Mozart transforms this shabby little shocker of a plot – as the meddling know-all Don Alfonso “tests” the two sisters’ fidelity to their sweethearts – into a vehicle for music of exquisite truthfulness that grows from a bed of fraud and lies.