Dyngus Day (Easter Monday) is a big deal in Buffalo. I've been the last two years and will be heading there again this weekend. I really enjoy the parade through Polonia not to mention the Polish food, beer and music.
Buffalo has a very big Polish American population. They're descended from the 1890-1920 wave, so there's more of a sentimental to Polish peasant "folk culture."
ETA: A book on differences between Polish Americans vs. Polish immigrants in 1980s Chicago:
https://books.google.ca/books?id=3zPchRriRIwC&printsec=frontcover&dq=opposite+poles+chicago&hl=en&sa=X&ved=0ahUKEwiJnfTUn9rLAhXryIMKHdy5AYQQ6AEIHDAA#v=onepage&q=opposite poles chicago&f=false
Despite Chicago and Toronto both being major destinations for the post-Soviet wave of Polish immigrants, Chicago's Polish immigrants still make up a lower proportion (about 15%) of the total claiming Polish ancestry in the city and its surroundings (over 900,000 or close to a million) than Toronto which has more like 100,000 with Polish roots but a quarter are immigrants.
As to Buffalo, I'm not sure where to find stats. New York state as a whole has about 95, 000 language speakers but probably a lot of that is NYC itself, and I'm not sure how many Polish Buffalonians speak the language.
Buffalo also has a large Black/African American community -- about 39% in 2010, compared to 30% in 1990. I wonder how much of that is due to recent immigration -- there are now sizable Somali and I think maybe other African immigrant populations in the city, though I think that most in Buffalo are native born African Americans. I don't know if the recent African immigrants to Buffalo have any ties/family connections north of the border to Toronto's.
Buffalo too I think is receiving a small but noticeable refugee/immigrant population from various parts of the world that may help thwart the population decline and revitalize the city.