to/at the concert
Are you going to the concert?
Tom va al concerto con Mary.
Tom goes to the concert with Mary.
Ero al concerto di Tom.
I was at Tom's concert.
Eri al concerto la scorsa notte?
Were you at the concert last night?
Ero sorpreso di vedere così tante persone al concerto.
I was surprised to see so many people at the concert.
Ziri è andato al concerto.
Ziri went to the concert.
C'erano così tante persone al concerto.
There were so many people at the concert.
Tom sedeva accanto a Mary al concerto.
Tom sat next to Mary at the concert.
Voi sarete al concerto stasera?
Will you be at the concert tonight?
Se non vai al concerto, allora non ci vado nemmeno io.
If you don't go to the concert, then I'm not going either.