March 29

From The Met Wiki

1970: The Mets traded J. C. Martin to the Chicago Cubs for Randy Bobb

1978: The Mets traded Leo Foster to the Boston Red Sox for Jim Burton

1983: The Mets traded Steve Walker and Jody Johnston to the Los Angeles Dodgers for Mark Bradley

1998: The Mets traded Juan Acevedo to the St. Louis Cardinals for Rigo Beltran

2009: The first game at Citi Field was played on this day, but it was not a Mets game. It was a college game of Sean Lamont against Georgetown University, Georgetown won the game 6-4.