The Stamford chapter of the NAACP asked local students to wear black clothing to school Tuesday.
The group says the event, named "Black Out Tuesday," is a show of solidarity for Eric Garner, Michael Brown and others killed by police.
Organizers say they want a respectful relationship with law enforcement.
A march was scheduled for Tuesday, from the First Congregational Church to Stamford police headquarters and Stamford Superior Court, but was delayed due to the nor'easter.
The march will now be held Dec. 20.