Há alguma referência de estudantes (ou seja, Hermione) usando aparição fora das aulas?

Concentrando-se apenas naqueles que são jovens o suficiente para serem estudantes durante os eventos dos romances de Harry Potter;

• Tanto Fred e George Weasley usam a aparição dentro dos limites do Largo Grimmauld em 'Harry Potter e a Ordem da Fênix'

With two loud cracks, Fred and George, Ron’s elder twin brothers, had materialised out of thin air in the middle of the room. Pigwidgeon twittered more wildly than ever and zoomed off to join Hedwig on top of the wardrobe.

• Harry Potter aparata em Relíquias da Morte

Meanwhile, inside number twelve, Harry had just entered the hall. He had nearly lost his balance as he Apparated on to the top step just outside the front door, and thought that the Death Eaters might have caught a glimpse of his momentarily exposed elbow

• Como faz Ron Weasley (e Hermione, obviamente)

She was impeded by her own Shield Charm; by the time she had removed it, he had already stormed into the night. Harry stood quite still and silent, listening to her sobbing and calling Ron’s name amongst the trees.
After a few minutes she returned, her sopping hair plastered to her face.
‘He’s g – g – gone! Disapparated!’

• Graham Montague aparata depois de ficar preso no armário desaparecendo

Montague told me that when he was stuck in the Hogwarts one, he was trapped in limbo but sometimes he could hear what was going on at school, and sometimes what was going on in the shop, as if the Cabinet was travelling between them, but he couldn’t make anyone hear him ... in the end he managed to Apparate out, even though he’d never passed his test.

_{^{(h / t para Himarm e Evdzhan Mustafa )}}

• No filme-verso, Draco Malfoy Aparece na masmorra de Hogwarts para resgatar Goyle e Blaise Zabini em Relíquias da Morte, Parte II.

Graham Montague, usa a aparatação para escapar do cabeamento de desaparecimento que foi depois transferido para o RoR. Acredito que Fred e Jorge o tenham preso para retaliar por ele ter abusado de seus poderes durante o regime de Umbridge.

Para completar a boa resposta de Richard:

Houve também:

• Percy, depois que ele passou no teste de aparição, na Toca

"Percy only passed two weeks ago," said George. "He's been Apparating downstairs every morning since, just to prove he can."
(Goblet of Fire, Chapter 6, The Portkey)

• [Side-Along Apparition] Harry (graças a Dumbledore) quando eles foram ao Slughorn's

Harry gripped Dumbledore's proffered forearm.

"Very good," said Dumbledore. "Well, here we go."

Harry felt Dumbledore's arm twist away from him and redoubled his grip; the next thing he knew, everything went black; he was being pressed very hard from all directions; he could not breathe, there were iron bands tightening around his chest; his eyeballs were being forced back into his head; his eardrums were being pushed deeper into his skull and then--

He gulped great lungfulls of cold night air and opened his streaming eyes. He felt as though he had just been forced through a very tight rubber tube. It was a few seconds before he realized that Privet Drive had vanished. He and Dumbledore were now standing in what appeared to be a deserted village square, in the center of which stood an old war memorial and a few benches. His comprehension catching up with his senses, Harry realized that he had just Apparated for the first time in his life.
(Half-Blood Prince, Chapter 4, Horace Slughorn)

• [Side-Along Apparition] Harry (graças a Dumbledore) quando eles foram de Slughorn para a Toca

"This will do, Harry. If you will grasp my arm."

Braced this time, Harry was ready for the Apparition, but still found it unpleasant. When the pressure disappeared and he found himself able to breathe again, he was standing in a country lane beside Dumbledore and looking ahead to the crooked silhouette of his second favorite building in the world: the Burrow.
(Half-Blood Prince, Chapter 4, Horace Slughorn)

• [Side-Along Apparition - ou algo como "Helped Apparition"] Harry (graças a Dumbledore) quando eles foram para a caverna

"It will not be necessary for us to enter," muttered Dumbledore, glancing around. "As long as nobody sees us go ... now place your hand upon my arm, Harry. There is no need to grip too hard, I am merely guiding you. On the count of three--one ... two ... three ..."

Harry turned. At once, there was that horrible sensation that he was being squeezed through a thick rubber tube; he could not draw breath, every part of him was being compressed almost past endurance and then, just when he thought he must suffocate, the invisible bands seemed to burst open, and he was standing in cool darkness, breathing in lungfuls of fresh, salty air.
(Half-Blood Prince, Chapter 25, The Seer Overheard)

• [Aparição ao lado de um aluno como "líder"] Harry ("carregando" Dumbledore) quando eles voltaram da caverna

Sodden and shivering, Dumbledore's weight still upon him, Harry concentrated harder than he had ever done upon his destination: Hogsmeade. Closing his eyes, gripping Dumbledore's arm as tightly as he could, he stepped forwards into that feeling of horrible compression.

He knew it had worked before he opened his eyes: the smell of salt, the sea breeze had gone. He and Dumbledore were shivering and dripping in the middle of the dark High Street in Hogsmeade.
(Half-Blood Prince, Chapter 27, The Lightning-Struck Tower)

• [Aparição lado a lado? obrigado a Snape? Outro Comensal da Morte? ou talvez a Aparição Regular] Draco quando fugiu com Snape e os Comensais da Morte - não consigo encontrar uma citação contando, aconteceu entre:

Snape and Malfoy, however, were still running; they would soon be beyond the gates, able to Disapparate--
(Half-Blood Prince, Chapter 28, Flight of the Prince)

e

Snape had managed to Disapparate just beyond the school's boundaries.
(Half-Blood Prince, Chapter 28, Flight of the Prince)

Sem mencionar, claro, as lições de Aparição, Teste de Aparição em Hogsmeade e as muitas Aparições de Harry, Rony e Hermione nas Relíquias da Morte (algumas delas sendo Aparições ao Lado e ao Lado, lideradas por um dos eles, alguns outros sendo aparições regulares). E também de Dean e Luna, ajudado por Dobby.