I know you have various topics for #WalkInsWelcome interviews, and I'm not sure if this guy would be interesting for your interview: his name is Charles Cather, an American that lives half of the year in Serbia for past 10 years.
He just received his Serbian honorary citizenship, signed off by our Prime Minister. So he is like an important American in Serbia.
Maybe his experiences, how he got there etc. could be an interesting chat to throw a bit more light how life is outside of US, how Serbia handled quarantine and corona virus or whatever you may find it interesting to talk to him about.