To find out if a block party is permitted, you can:

• Contact the local community board; you can look up the community board for an address here
• Call the Office of Citywide Event Coordination and Management at (212) 788-7567, Monday to Friday between 9:00 AM and 5:00 PM
• Write a letter to:
  CECM - Street Activity Permit Office
  100 Gold Street, 2nd Floor
  New York, NY 10038