Okla. Stat. tit. 25, § 90.3

The first Sunday in June each year is hereby established as "Shut-In Day" in Oklahoma to be commemorated by calling upon the people of Oklahoma to observe such day by visiting at least one shut-in person on the special day if possible, and by participating in other appropriate ceremonies and activities. Laws 1982, H.J.R. No. 1028, § 1.