Conversation so far:
who made martin luther king day a federal holiday
President Ronald Reagan signed the Martin Luther King Jr. Day holiday into law in 1983, and it was first observed three years later.
why was martin luther king day first observed three years later
Although Martin Luther King Day was signed into law, it took effect three years later. Not every U.S. state chose to observe the holiday at the state level until 1991.

Question: what day does the holiday fall on
Self-contained rewrite: what day does martin luther king day fall on