Yankees-Mets 9/11 ceremony to feature Joe Torre, Bobby Valentine, Mike Piazza; Giants, Jets to honor 20th anniversary of terrorist attacks
Mets–Yankees rivalry - Wikipedia
N.Y. Mets will not be holding Old-Timers' Day this season
Mets, Yankees and more pay tribute on 9/11 20th anniversary
Yankees, Mets finally get to mark 9/11 anniversary with commemorative caps in-game
Documentary On Mets' First Home Game After 9/11 Delivers Memories And Lessons That Resonate 20 Years Later
20 years later: Ex-Braves reflect on first game in New York after 9/11
Mets will wear special uniforms to mark 9/11 anniversary
Yankees' 2023 schedule released, will host Giants on Opening Day - Pinstripe Alley
Yankees reflect on returning to baseball after 9/11
Watch Mets, Yankees pay respects on 9/11 anniversary, crowd erupts into chants of USA
Should the New York Yankees and the New York Mets play each other in a series every year on September 11th? Why or why not? - Quora
Mets vs. Yankees: Lineups, broadcast info, and open thread, 9/11/21 - Amazin' Avenue
Mets, Yankees to wear first responder caps for 9/11 remembrance game vs. Yankees
Memorable Mets Game: September 21, 2001 - Amazin' Avenue