Philomath Museum is offering guided docent tours this fall to its ongoing exhibit marking the 250th anniversary of the United States. “Centuries of Celebration,” which opened April 25 and remains on display through Jan. 2, features artifacts, memorabilia and cultural symbols from the 1876 Centennial and 1976 Bicentennial commemorations. Tours take place indoors at the museum and last about 30 minutes. Among the items featured in the exhibit is a Revolutionary War-era drum, along with antique hand-stitched American flags and souvenir calendars produced for the bicentennial celebration. The quilt bears more than 60 signatures from celebrities of the era, including Gloria Steinem, Elvis Presley and Julia Child.