Stand-up comedian, actor, and writer Pete Davidson, whose father, Scott Davidson, was a firefighter killed in the line of duty in the 9/11 terrorist attacks, joins with 9/11 Day to "UNIITE For Good" for the 25th anniversary of 9/11, encouraging Americans to visit 911day.org and join him in honoring those lost and affected by the attacks, not only through remembrance, but also by doing good deeds.