In a theatre, the stage is an area where actors or other entertainers perform.
舞台 She pirouetted across the stage.
If you stage an event or ceremony, you organize it and usually take part in it.
主办; 举行 Atlantic City is the hot favourite to stage the fight.
on the stage 在舞台上
in the stage 在某一阶段(时期)
stage fright 怯场(舞台上害怕,但不特指舞台)