HP, World Cup, Hermione

“You foreign?” said Mr. Roberts as Mr. Weasley returned with the correct notes.
“Foreign?” repeated Mr. Weasley, puzzled.
“You’re not the first one who’s had trouble with money,” said Mr. Roberts, scrutinizing Mr. Weasley closely. “I had two try and pay me with great gold coins the size of hubcaps ten minutes ago.”
“Did you really?” said Mr. Weasley nervously. Mr. Roberts rummaged around in a tin for some change.
“Never been this crowded,” he said suddenly, looking out over the misty field again. “Hundreds of pre-bookings. People usually just turn up. . . .”
“Is that right?” said Mr. Weasley, his hand held out for his change, but Mr. Roberts didn’t give it to him. “Aye,” he said thoughtfully. “People from all over. Loads of foreigners. And not just foreigners. foreigners. Weirdos, you know? There’s a bloke walking ’round in a kilt and a poncho.”
“Shouldn’t he?” said Mr. Weasley anxiously.
“It’s like some sort of . . . I dunno . . . like some sort of rally,” said Mr. Roberts. “They all seem to know each other. Like a big party.” Rowling, J.K. Harry Potter and the Goblet of Fire (p. 31). Pottermore Publishing. Kindle Edition.

Hermione got a calculating look in her eye and held her hand out to the wizard in white that had just popped out with his wand, “Mr. Roberts, did no one bother to tell you they had booked your area for a large outdoor science fiction and fantasy convention?”
Harry grinned as Mr. Roberts eyes lit up in recognition and the wizards in the group all looked confused.
“No lass they didn’t, but it all makes so much sense now. Thankee for letting me know. So, this is those…what do they call themselves now…”
“Recreationists. And yes, they are. This is a cock up from on high if the national people didn’t tell you the international convention was being held here. And a whole bunch of live action recreationists were going to be around.”
He nodded as the wizard behind him relaxed his stance and went back to hiding. “Well lass you know the big wigs in high places never telling us lower peons what goes on. Now, for you pre-booked under Weasley did you….”

She was taken aside before the game, after the tents were put up, and with the help of Mr. Weasley, given the in she needed for the DoM for her quick thinking.