Children ages 5-11 are being asked to show proof of at least one COVID-19 vaccine before entering Radio City Music Hall, but the venue says entry will not be denied without the proof until Dec. 27.

The mayor, however, when asked said the city is not giving a cushion of time between those dates - specifically saying "we mean business here."

"If you're any of the establishments covered by a Key to NYC, you have to be clear with families if they bring a five to 11-year-old, they got to have at least that first dose to be able to go into a restaurant, to a fitness area, or entertainment," said de Blasio.