There is established a bill of rights day for the state of Montana. The bill of rights day is December 15 of each year to commemorate the day in 1791 in which three-fourths of the states ratified the bill of rights as part of the U.S. constitution.
Bill Of Rights Day
Mont. Code Ann. § 1-1-227, under General Definitions of Terms Used in Code.
Mont. Code Ann. § 1-1-227