FREE Traveling exhibit from the Smithsonian Institution’s National Museum explores when millions of Mexican guest workers came to the United States to help fill the labor shortage during World War II & beyond. Donation suggested. Thursdays–Saturdays. 10 a.m.–4 p.m. See the exhibit at 3 sites: Courthouse Museum (255 N. Main St., Lakeport); Schoolhouse Museum (16435 Main St., Lower Lake); Gibson Museum (21267 Calistoga Rd., Middletown). facebook.com/MuseumsOfLakeCountyCa.