"the homemade nature of the experience...permits students to create the illusion in their own minds" #wymhm

n the Percy Jackson books, misunderstood children find out they are modern-day mythological heroes. Interest in Camp Half-Blood has been growing, perhaps because a Percy Jackson movie was released this year, or because the series features its own Camp Half-Blood, where Percy and other middle school demigods find refuge.

An independent bookstore in Austin, Tex., held the first Camp Half-Blood in 2006. The store, BookPeople, had been hosting dramatic readings of manuscripts in the series, and one day Topher Bradfield, the children’s activity coordinator, said to his young listeners, “Wouldn’t it be great if Camp Half-Blood was a real place?”

“The kids,” Mr. Bradfield recalled, “looked at me as if I’d sprouted a second head, and were like: ‘Yeah, duh. Of course!’ ”

The day camp, which is held in a state park, attracts children from as far away as Brazil and Britain, who stay with their parents in nearby hotels. This year, the camp’s 450 spots sold out in an hour and a half, Mr. Bradfield said.

The camps run by bookstores, which are also in Decatur, Ga., and now in Brooklyn, are not fancy affairs. A casual observer of the various Camp Half-Bloods would see a few decorations and children in matching camp T-shirts jousting with foam swords or javelins. Gods, oracles and monsters are played by actors, counselors or volunteers.