The nonprofit organization Napa County Landmarks is dedicated to the preservation of historic architectural treasures throughout Napa County, including those on wheels. This weekend’s third annual Vintage Trailer Hitch Up looks back in time to the kitschy world of classic travel trailers from the ’30s to the ’60s, such as a 1947 Vagabond and a rare 1937 Covered Wagon. As you tour the rigs, live music, food trucks and good old American craft beers revel in yesteryear on Saturday, Aug. 12, at Bothe State Park, 3801 St. Helena Hwy., Calistoga. 11am. $20; $15 for kids 12 and under; $8 parking fee. Advance tickets recommended. 707.255.1836.