Okla. Stat. tit. 19 § 166
Failure of a county officer to attend any school, conference or meeting unless excused prior thereto shall cause the county officer to forfeit his right to the monthly travel allowance provided by Section 165 of this title for the month in which such school, conference or meeting is held. The directing state officer or agency head shall notify the county clerk of the county of the forfeiture of such county officer. Any county, county officer or deputy may join his respective state, national or international association, including but not limited to, the National Association of Counties, the International Association of Assessors and the International Association of Clerks, Recorders, Election Officials and Treasurers. It shall not be mandatory for a county officer or his deputy to attend any meeting, school, institute or conference sponsored or held by anyone other than a state officer or agency head, but if funds are available for travel to such meeting, school, institute or conference, either within or outside this state, from funds appropriated for traveling expenses in addition to the monthly travel allowance provided by Section 165 of this title, then it shall be lawful for such traveling expenses to be paid from such travel funds so appropriated to the county officer or his deputies.
Okla. Stat. tit. 19, § 166