showing stellarium at event with charge

 I am writing from Japan.
 I am planing to show stellarium on big screen with projectors for stage effect at an event held in Tokyo.
The event is not free of cost to get in, there will be admission fee.
There may be cameras of media for broadcast the event.
I will not change any code of stellerium.

I am afraid showing stellerium will be infringe on its copyright.
I read through GPL(that was taugh for me), and understood that making and selling copys of stellarium is alright, but it seems no direct mention that using stellerium at event with admission fee is infringe GPL or not.
Would you Please advice me on this matter?
Thank you.