Is earning from freelance writing for a sports arena which includes haram things halal?

I'm doing a freelance job to earn enough to buy a laptop to help me with my studies. My freelance writing job includes me writing about a sports arena in the US which include all sorts of haram things ranging from music to alcohol bars. My employer has instructed me to write articles in a way that would advertise the arena and make people consider to go watch the games and buy tickets in it. Is advertising such a place haram? If yes then what should I do with the money I've already earned for writing a few articles already?