“Anonymous,” a mysterious collection of photos and quilts owned by Robert Flynn Johnson, is on exhibit noon to 4 p.m., Thursday through Monday through Sept. 19 at the Petaluma Arts Center, 230 Lakeville St. Johnson is a retired curator at the Fine Arts Museums of San Francisco. His collection focuses on the human condition, and select items will be on sale. For more information, call 762-5600 or visit petalumaartcenter.org.

Lawson’s Landing campground at Dillon Beach will hold a cleanup 10 a.m.-8:30 p.m. Friday through Sunday, Sept. 11. After many years of use, the family friendly site is asking locals to give back and help clean up the area. With the current struggle to keep Lawson’s Landing open to the public, the volunteer work is vital to the campground’s survival. lawsonslanding. com.

“She Loves Me” opens at Cinnabar Theater Friday and runs through Sept. 25 at 3333 Petaluma Blvd. N. Friday and Saturday shows begin at 8 p.m. Sunday matinees will be added at 2 p.m. Sept. 18 and 25. In this musical romantic comedy, two feuding shop clerks fall in love with their pen pals. It is based on the story “Parfumerie” by Miklos Laszlo, with music by Jerry Bock and lyrics by Sheldon Harnick. General tickets are $35, seniors $32, 22 and under $25. 763-8920, cinnabartheater. org.

The Petaluma Arts Association hosts its annual Art in the Park festival 10 a.m.-5 p.m. Saturday and Sunday, Sept. 11, at Walnut Park, at the corner of Petaluma Blvd. S. and D St. Artists will sell their paintings, sculptures and garden art, with live music and a Saturday farmers market 2-5 p.m. All donations go to art scholarships for local students. 762-2978, petalumaart.org. 

The Petaluma Museum’s lecture series “2012, End of Days” continues Friday and Saturday at the museum, 20 Fourth St. Anthropologist, astrologist, linguist and Tulane University professor Judith Dides will discuss “Mayan Hieroglyphics, the Calendar and 2012” at 6 p.m. Friday. A panel of religious leaders including Rev. Blythe Sawyer of United Church of Christ, Rev. Daniel Green of St. John’s Episcopal Church and Rabbi Ted Feldman of B’Nai Israel will discuss the End of World as it relates to biblical scripture at 4 p.m. Saturday. Admission is $5. Visit petalumamuseum. com or call 778-4398 for more details.