Mathematics Awareness Month happens in April of each year under the auspices of the Joint Policy Board for Mathematics (JPBM), which is composed of the MAA, the American Mathematical Society, the Society for Industrial and Applied Mathematics, and the American Statistical Association. Math Awareness Week was first celebrated in 1986 with a proclamation by President Reagan; the event was expanded to a full month in 1999. The original week included mostly activities at the national level (at the Smithsonian, for example), but since then the emphasis has shifted to local and regional activities intended to highlight the importance of mathematics. The MAM web site provides a wide range of resources to help individuals and institutions organize activities during the month.
More information on Mathematics Awareness Month, theme essays (on the shape of space, celestial mechanics, and the design of space missions), tips on how to contact the media and get coverage for local events, and many other resources can be found at the new Math Awareness Month website at http://www.mathaware.org.