Celebrate Independence Day with the Mets (mets.com) this year. There will be fireworks on July 2, following a game against the Cubs. Or catch the "Mr. Met Dash," a post-game affair on July 4 when fans 12 and under can run the bases. June 29 is when Mike Piazza replica jerseys will be distributed. And the June 30 game starts with a ceremony marking the retirement of Piazza's #31. On Aug. 27, before the game against the Phillies, the first 15,000 fans in attendance will score a Matt Harvey bobblehead. For the Yankees (yankees.com), Old Timers Day arrives June 12 before a game against the Detroit Tigers. On Aug. 14, Mariano Rivera gets recognition in Monument Park. And the 1996 World Series is remembered with a ceremony Aug. 28.