Beach Bash: Milk carton boat races, canoeing and paddling instruction, kids activities and more. 10 a.m. to 4 p.m. Free. Thomas Beach, Lake Calhoun, William Berry Pkwy. and E. Calhoun Pkwy.
10 Best Days of the Bakken: Electrifying activities with the theme, "Backyard Discovery." 10 a.m. to 5 p.m. Free. Bakken Museum, 3537 Zenith Av. S.
Historic Main Street Walking Tour: Mill City Museum, 704 S. 2nd St. (Contact the museum to make sure event is not canceled by state government shutdown. Phone: 612-341-7555. Online: www.millcitymuseum.org.)
Memorial Exhibit: A mini-exhibit of festival memorabilia from the last 72 years. 1 to 5 p.m. Hennepin History Museum, 2303 3rd Av. S.
Minneapolis Sister Cities Day Celebration: An event highlighting the culture and music of Minneapolis' 10 sister cities internationally. Ice cream and beverages served. Free. 1 to 5 p.m. Nicollet Island Pavilion, 40 Power St.
Tennis Classic: 8 a.m. to 5 p.m. One Financial Plaza.
10 Best Days of the Bakken: Electric with the theme, "Frankenstein." 10 a.m. to 5 p.m. Free. Bakken Museum, 3537 Zenith Av. S.