Calendar. Scheduled Events in 2020. If you are planning a trip to the beautiful Black Hills this year, here are some special event dates that might be of interest to you and your family. Ranger-Guided Snowshoe Hikes - January 18 and February 8. Calendar - Jewel Cave National Monument (U.S. National Park Service) Junior Ranger Day / Let's Go for a Hike - August 15.
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