Okla. Stat. tit. 25, § 25-82.2: Additional holidays - Acts performable - Optional closing

by banks and offices.

The following additional days are designated as holidays:

Jefferson Day on the 13th day of April; Oklahoma Day on the 22nd

day of April; Mother's Day on the second Sunday in May; Juneteenth

National Freedom Day on the third Saturday in June; Indian Day on

the first Saturday after the full moon in September; Cherokee Strip

Day on the 16th day of September; Will Rogers Day on the 4th day of

November; Citizenship Recognition Day on such date as may be fixed

by the Governor; Oklahoma Historical Day on the 10th day of October;

Senior Citizens' Week beginning with the first Sunday in the month

of May; Senior Citizens' Day the Wednesday of Senior Citizens' Week;

Grandparents' Week beginning with the second Sunday in September;

Youth Day on the third Sunday in March each year; each day in which

a state election is held throughout the State of Oklahoma; and such

other days as may be designated by the President of the United

States or the Governor of the State of Oklahoma. Notwithstanding

the day designated for Veterans' Day by Section 82.1 of this title,

any bank, savings and loan association or credit union may observe

the fourth Monday in October as Veterans' Day. Any act authorized,

required or permitted to be performed on any holiday as designated

in this section may and shall be performed on said day the same as

on any business day; provided any state, national or federal reserve

bank, building and loan association, credit union, state, federal,

county or municipal office may close on any day designated in this

section as a holiday, and, upon such bank, building and loan

association, credit union, or public office being closed on such

day, any act authorized, required or permitted to be performed at or

by such bank, building and loan association, credit union, public

office or public official may be performed on the next succeeding

business day and no liability or loss of rights of any kind shall

result from such delay.