As reported by the Bismarck Tribune.
A flier announcing the event read (in English, with Sioux language interspersed):
FORGIVENESS
WALK & CEREMONY
Legion Park
9AM-11AM
Mandan, North Dakota
Sunday, November 6, 2016
For all water protectors who wish to relieve themselves of burdens of bitterness and anger they may feel due to traumatic experiences with police. "Until we heal we won't be able to think clearly, act constructively, or truely serve Mitakue Oyas'in, all our relatives."
We will walk from Legion Park, 1111 10th Avenue S.W. (along Heart River), to Morton County Police Station in Mandan, ND. At that point we will do a ceremony and ask for the ability to forgive. All are invited. Prayer walk is 1.4 miles each way. Organizers have worked with Mandan office[r]s to protect and coordinate this event.
FB: Water Protection Forgiveness Walk
The traumatic experiences referenced included those on October 27th, "a shameful moment for this country."