May 31 Anniversaries

World No Tobacco Day

World Observances

What Is World No Tobacco Day? May 31st is "World No Tobacco Day," an internation...

Reclaimed Lumber Day (Kozai no Hi) — 5/31, from "ko(5)-za(3)-i(1)"

Industry Days

What Is Reclaimed Lumber Day? May 31st is celebrated every year as "Reclaimed Lu...

Vegetable Day (Sai no Hi)

Wordplay Anniversaries

What is Vegetable Day? The 31st of any month is celebrated as "Vegetable Day" (S...