Here, from AILR:
AILR has proudly served Native communities since 1973, and each year at this time we encourage law students nationwide to participate in this, the longest-running competition of its kind. Papers will be accepted on any legal issue specifically concerning American Indians or other indigenous peoples. Three cash prizes will be awarded, including $1,000 for the first place winner.
The competition is open to all students enrolled in J.D. or graduate law programs at accredited law schools as of the competition deadline of Jan. 31, 2018. Winners will be announced on or before May 1, 2018.
The full rules sheet is available at http://www.law.ou.edu/faculty-and-scholarship/journals/american-indian-law-review/writing-competition.