Events that will matter.

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March 29: The National Marathon

Over 5,000 runners will participate in this year’s D.C. marathon, making their way through the city’s streets in what is fast becoming a rite of spring. The race’s 26.2-mile route winds through neighborhoods and monuments, highlighting our nation’s history, and as the runners will attest, topography.

April 1: April Fool’s Day

Along with initiating the annual spring fever epidemic, the first day of April gives every class clown and closeted comedian a chance to grab their 15 minutes. So be on your guard; hoaxes and pranks abound, and if you’re not careful, the joke may be on you.

April 2–4: The 20th Annual NATO Summit

Bucharest, Romania, gets to host this year’s NATO Summit, after U.S. under secretary of state for political affairs, R. Nicholas Burns, stated in December 2006 that he believed Romania should be rewarded for its effort in the wars in Afghanistan and Iraq.

March 31: International Criminal Court

Initially proposed 60 years ago as the venue for trying crimes against humanity, the International Criminal Court is ready to hold its first hearing. On trial is Congolese rebel leader Thomas Lubanga, who is charged with conscripting child soldiers into his army.

April 7: NCAA Men’s Basketball Championship Game

The college basketball season culminates with its championship game in San Antonio. This year, a new school will cut down the nets, as two-time defending champion University of Florida failed to make the field of 65 teams.

March 30: Open Skies Agreement Begins

This accord between the U.S. and the European Union expands cooperation and increases competition for trans-Atlantic aviation between the U.S. and 11 E.U. countries. Though the skies may be friendlier, it probably won’t shorten the boarding process.

March 27–30: The Armory Show

The world’s leading contemporary art fair takes place over four days at Pier 94 in New York City, the home of more artists and galleries than any other city in the world. And after more than $85 million of art was sold in four days at last year’s show, interest in this year’s event is especially high.

March 31: MLB Opening Day

Though the first game of the season was played on March 25—when the Boston Red Sox took on the Oakland Athletics in the first of a two-game series in the Tokyo Dome in Japan—the rest of the league starts play on the 31st with a slate of games that’ll bring fans out to ballparks around the country.