The main event takes place in downtown Chestnut Hill (aka "Hogsmeade") — a Philadelphia neighborhood complete with cobblestone streets and a working trolley.
"We estimate 10,000 to 12,000 people attended this year," Sharkey told TI. Below you can see the crowds gathered at the train station, where the "Hogwarts Express" arrived from downtown Philly.
In town, the local shops were revamped for the day — taking on the names of stores from the Harry Potter books. "Our stores came up with their names," Sharkey explained.
They really got into it, selling themed goodies like these Golden Snitch Truffles. The Chestnut Hill Business District helps shops come up with merchandise ideas.
And of course, there was Butterbeer — the beverage of choice sold at the Three Broomsticks pub in Hogsmeade.
Hagrid was on hand, selling bottles of Butterbeer to eager Muggles. (Pink umbrella not photographed.)
Down the road, Chestnut Hill College is nestled among the trees. It looks just like a real-life Hogwarts!
This is where the Quidditch Tournament was held. If you don't know, Muggles adapted the magical sport for themselves in a mash-up of dodgeball, soccer, and rugby. The game is super fun to watch, with lots of tackling and epic one-handed catches.
Here's a taste of the game in action. Chestnut Hill College has been hosting this tournament for the past six years.
Albus Dumbledore and Minerva McGonagall were nearby, making sure the witches and wizards were enjoying themselves.
This Harry Potter lookalike was a celebrity in his own right. He even taught a "Defense Against the Dark Arts" class to a group of excited kids.
The town was dotted with "Educational Decrees" — just like Hogwarts was in the fifth book, "Order of the Phoenix."
Hand-painted signs directed the festival goers to activities. Can you spot the Dementors hanging in the background?
One popular activity was the Sorting Hat. Adults and kids alike lined up for their chance to hear which Hogwarts House they belonged to. This would-be witch looks like she just got sorted into Slytherin. The horror!
Loyal members of Gryffindor and Hufflepuff gobbled up these themed cookies. The magical treats seemed never-ending.
Small photo-ops like this one helped make the festival even more fun. (I insisted on being Harry since I already had the glasses. My Hermoine was a good sport.)
Chestnut Hill College hosted an interdisciplinary conference, featuring literature and psychology professors who gave talks on the many layers of Harry Potter. From analyses of fantasy tropes to studies on how reading Harry Potter is proven to improve empathy, the conference gave a fascinatingly academic look at the books.
The festival finale was a concert, featuring the first-ever "Wizard Rock" band Harry and the Potters. The talented trio entertained with comedic punk rock songs like "Save Ginny Weasley from the Basilisk." It was the perfect end to the magical weekend.
