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Killdeer Mountain Roundup Rodeo. Begun in 1923, this is North Dakota's oldest rodeo sanctioned by the PRCA. The community goes all out, hosting a parade, street dance, community barbecue, and fireworks display on July 3 and 4. 701/764–5777. www.kildeer.com.
Founder's Day. Each August 25, this holiday commemorates the establishment of the National Park Service in 1916. The visitor centers host special programs and serve cookies and lemonade. 701/623–4466.
Stargazing. Without light pollution from nearby towns, Theodore Roosevelt National Park is ideal for astronomical observation any cloudless night of the year. To enjoy the stars with others, come during an annual event when, on a late August weekend, the Northern Sky Astronomical Society sets up telescopes for an all-night star-watching party. No phone. www.und.edu/org/nsas. Free.
Old-Fashioned Cowboy Christmas. Held the first full weekend in December in downtown Medora, the festivities begin with a wreath-hanging ceremony at the community center, followed by poetry readings, a holiday doll show, sleigh rides, and a dance. 701/623–4910.