The original Inverness post office was a modest, eight-by-eight-foot log cabin built in 1897 across from where the Gables now stands. A few years later, it caught the eye of Martha Schreiber, one of the first people to purchase a residential lot in Inverness. Ms. Schreiber made a colored lithograph of the structure in 1905. Next weekend, attendees at the Inverness Fair can nab a postcard bearing that image along with a commemorative postmark to celebrate the 30th anniversary of the Inverness Foundation’s purchase of the Gables, in a partnership with the U.S. Postal Service. “The fact that we’re partnering with the postal service to make the postmark is really cool,” said Alex Porrata, a co-chair of the fair with Elizabeth Whitney. The Gables, owned by historian Jack Mason until his death in 1985, houses both the Inverness Library and the Jack Mason Museum of West Marin History. The fair, held on Saturday, Aug. 13 from 10 a.m. to 3 p.m. in downtown Inverness, will feature the traditional lineup of fundraisers and events throughout the day, which starts with an 8 a.m. pancake breakfast hosted by the Tomales Bay Youth Center. Proceeds from a hot dog lunch will benefit the Inverness Yacht Club’s summer youth sailing program, a tostada booth will benefit Waterdogs youth swimming lessons and a rummage sale and plant sale will benefit the Inverness Garden Club’s Scholarship Fund. “The fair is a traditional event that brings the Inverness community and the local nonprofit community together,” Ms. Porrata said. The event will also include live music by Amber Hines of Bolinas and Burton Eubank’s band The Bloodstones, raw and grilled oysters, face painting, balloon animals, button-making, fire extinguisher refills, Inverness-themed souvenirs sold by Ms. Porrata’s daughter, Lulu, a used book sale and a cake walk. The fair is still seeking cakes; bakers can contact Ms. Porrata at [email protected] for more information.