Pete Alonso on Mets wearing first-responder hats: 'I'm really, really happy about it' - Newsday
Mike Piazza suggests 9/11 national remembrance
Yankees, Mets get green light from MLB to wear first-responder caps on 9/11 anniversary
NY Mets To Wear FDNY, NYPD Caps During 9/11 Anniversary Game
Yankees, Mets Honor New York First Responders Sunday, 21 years after 9/11 - Fastball
Yankees, Mets to both host 9/11 anniversary games for first time - Newsday
MLB finally gives Mets permission to wear NYPD, FDNY hats on anniversary of 9/11
Mets Amazin' Day: Here's what to do in New York City
Joe Torre defends MLB's rejection of Mets commemorative 9/11 hats, says league policy is unlikely to change