Many had been showing up twice a week for the sessions since the start of July to read, discuss and write about the books they were assigned to read this summer.
"You could read at home, or you could come here and read it as a group," said Jesse Oyola, 13, whose parents had driven him to and from their home in North Philadelphia for every session.
"This will give you a boost," added Khalif Khan, 15, another session regular.
Although charter officials encouraged students to attend, they didn't entice them with candy, snacks or prizes and were amazed by the turnout. They had to scramble to rent the room at First District Plaza because the charter's temporary offices eight blocks away had space for only half the crowd.
"I didn't think everybody was going to show up," said David Hardy, the charter's founder and chief executive officer.
In all, he said, 80 percent of the 150 members of the inaugural ninth grade have participated in some or all of the voluntary sessions. Students work in groups with teachers and are assisted by a few student tutors from top local public and private schools.
"These guys," Hardy said as he looked around the room at the students bent over their paperbacks, "are going to have a leg up."
Boys' Latin is a first on many fronts: It's the first single-sex charter approved in Pennsylvania. It's the first publicly funded school in Philadelphia that requires students to take Latin. And it's the first charter in the region modeled after the rigorous Boston Latin School.
The Philadelphia School Reform Commission initially rejected the charter application in January 2006 after the Education Law Center, the Women's Law Project, and the Public Interest Law Center of Philadelphia complained that a single-sex charter school would violate state and federal laws. The commission reversed itself six months later.