an instance of being allowed to enter a club, disco, hospital, museum etc

entering or allowing entry

(the person responsible for) the origin of a book etc

origin

the starting point

start of an event or action

(of an actor, musician etc) a first appearance on a public stage

first public appearance

installation of newcomers

installation of newcomers

the start

beginning

introduction

something new; something that begins

the process of introducing or being introduced; an opening part of a letter, speech, etc; explanatory article at or before the beginning of a book

something new; something that begins

the birth of Jesus Christ

beginning, inception

the first part of a journey, activity etc; (to cause a person, thing) to take the first action, go into operation

beginning

a place where an activity starts

beginning, inception