Final answer:
The question is about an event related to Native American and Alaska Native tribal governments that occurred on October 17, 1949.
Step-by-step explanation:
The National Congress of American Indians (NCAI), founded in 1944, is considered the oldest and largest organization representing Native American and Alaska Native tribal governments. However, based on the given information, the correct answer seems to be related to an event that occurred on October 17, 1949.
Unfortunately, the given information is not clear enough to determine the exact answer. Therefore, additional information is needed to properly address the question.