A little more than a year ago, Tredyffrin Township decided to throw itself a party to mark the Chester County township's 300th birthday.

Local officials and volunteers shifted into overdrive preparing for Tredyffrin 300, a 10-day span of events that starts Sept. 14. With the kickoff three weeks away, officials say they're ready.

"I'm overwhelmed, stressed, any of these kinds of adjectives," cochair Pattye Benson said. "But from a volunteer standpoint, people are still coming out of the woodwork at the ninth hour to help. It's great."

Led by Benson, president of the Tredyffrin Historic Preservation Trust, and Judy DiFilippo, chairman of the township's board of supervisors, Tredyffrin 300 has come alive in various forms.

A 95-page book tracing the township's past from the time of the first Welsh settlements to the present was published by the Tredyffrin Easttown Historical Society.

It's selling so briskly that only 300 of the initial 1,000 copies remain, and a second printing might be needed.

The book tells how the agrarian township grew up around its Indian paths, creeks and limestone quarries, and how its population doubled from 1950 to 1960 with the building of the Pennsylvania Turnpike and Schuylkill Expressway.

"A lot happened here," said Kathy King, who supported her husband, Mike Bertram, as he compiled the book with 10 other volunteers. "It's not just some township near the King of Prussia Mall."

A documentary film called Tredyffrin - The First 300 Years will debut Sept. 15 at an open-air celebration planned for Wilson Farm Park in Chesterbrook.

The film shows what township life might have been like in pre-Revolutionary War days, and how it looked in the more recent past. The work draws on local historians and the archives of Valley Forge National Historical Park, Benson said.

"Twenty-five people were interviewed," said Benson, executive producer for the project. Old home movies, mementos and photos were used. The trailer can be seen on www.youtube.com.

And a series of public events is planned. Among the events are a black-tie-optional gala on Sept. 14, a vintage fashion show Sept. 20, and a historic house tour Sept. 22. Concerts and lectures are scheduled as well. Tickets for the events can be reserved at www.tredyffrin300.org.

Funds for the party have come from corporations, individual donors and even churches, Benson said. The largest donor was Tredyffrin Township, which allocated $50,000. The Chester County Conference and Visitors Bureau provided a $10,000 grant.

Proceeds will enable the Tredyffrin Easttown Historical Society to archive digitally its 70 years of historic records. Proceeds also will benefit a Tredyffrin Historic Preservation Trust project, restoring the Jones Log Barn. The 18th-century structure has been taken apart and needs to be rebuilt at Wilson Farm Park.

"It was on private property in poor condition," Benson said. "It was going to be demolished, but we discovered it was worth saving." The project will cost $400,000 to $500,000, she said.

Bertram, editor of the the Tredyffrin history book, said the township has many historic buildings, although some are hidden because they exist as portions of much larger modern structures.

One of these, the first Blue Ball Inn, is depicted in the book. Its 1724 kitchen is part of a private home on Glenn Avenue, Bertram said.

"There's gems around, but people don't shout about it," Bertram said.

Another relic more easily seen is the one-room Diamond Rock, or Octagonal School. It opened Sept. 21, 1818, at Yellow Springs and Diamond Rock Roads, and cost $260.91 to build, the book said.

Volunteers, who had but 14 months to complete the book, relied heavily on the society's quarterly articles for content. The book has become a surprise best seller in Tredyffrin.

"Our neighbors who have read it have gotten a kick out of it," King said.