Book this event only when you say

An availability schedule that a team event uses on top of its hosts' own schedules. Bookers only see times when a host is free and the restriction allows it, so the event can run on fewer days or hours without anyone changing their working hours.

Round-robin and collective event types of teams inside a Cal.com organization. The setting is Add restriction schedule, on the event type's Availability tab.

The schedule's own time zone by default. Tick Use booker's timezone and the same hours apply wherever each booker is, so 9:00am to 12:00pm means a morning in London and a morning in New York.

Then that time isn't offered. The whole meeting has to fit inside the restriction, and a booking sent for a time outside it is turned down.

Edit the schedule like any other availability schedule: Edit availability on the card opens it. A date override on the restriction schedule changes the hours for that date only.

Open the troubleshooter for the event. A time the restriction removed shows Restriction schedule as the reason, with the schedule's name and the time zone it's applied in.