Any email or chat
Type the names, joined by +
Lena writes cal.com/lena+felix+ida straight into her reply to Priya. Nothing to set up first, as long as each of them has Dynamic group links turned on in Settings.
Booking page
One booker for all three
The link opens a Group Meeting with every face and name on it, 30 minutes by default, on the first person's video app.
Availability
Only the times everyone is free
Cal.com reads all three calendars and keeps the half hours nobody is busy. On Thursday that leaves five.
Confirmation
Priya books once
She picks 10:30 London time and confirms. Lena, Felix and Ida are all on the booking, and everyone gets the email.
Calendars
In three calendars at once
The meeting lands in each host's calendar, in the gap their own meetings left, with the same call link for everyone.