Harry Potter and the Goblet of Fire, Chapter 20: The First Task
He forced down some dinner after Divination, then returned to the empty classroom with Hermione, using the Invisibility Cloak to avoid the teachers. They kept practicing until past midnight. They would have stayed longer, but Peeves turned up and, pretending to think that Harry wanted things thrown at him, started chucking chairs across the room. Harry and Hermione left in a hurry before the noise attracted Filch, and went back to the Gryffindor common room, which was now mercifully empty.
At two o’clock in the morning, Harry stood near the fireplace, surrounded by heaps of objects: books, quills, several upturned chairs, an old set of Gobstones, and Neville’s toad, Trevor. Only in the last hour had Harry really got the hang of the Summoning Charm.
“That’s better, Harry, that’s loads better,” Hermione said, looking exhausted but very pleased.
“Well, now we know what to do next time I can’t manage a spell,” Harry said, throwing a rune dictionary back to Hermione, so he could try again, “threaten me with a dragon. Right . . .” He raised his wand once more. “Accio Dictionary!”
The heavy book soared out of Hermione’s hand, flew across the room, and Harry caught it.
“Harry, I really think you’ve got it!” said Hermione delightedly.
“Just as long as it works tomorrow,” Harry said. “The Firebolt’s going to be much farther away than the stuff in here, it’s going to be in the castle, and I’m going to be out there on the grounds. . . .”
“That doesn’t matter,” said Hermione firmly. “Just as long as you’re concentrating really, really hard on it, it’ll come. Harry, we’d better get some sleep . . . you’re going to need it.”
Harry had been focusing so hard on learning the Summoning Charm that evening that some of his blind panic had left him. It returned in full measure, however, on the following morning. The atmosphere in the school was one of great tension and excitement. Lessons were to stop at midday, giving all the students time to get down to the dragons’ enclosure — though of course, they didn’t yet know what they would find there.