A craft fair, classical music, and a half marathon in Jackson Park; Chicago Tonight knows what's going on this weekend.

On this edition of Chicago Tonight's Field Trip, we hit the road with The Field Museum’s Fossil Invertebrates Collections Manager to hunt for fossils from a time when Chicago was a tropical reef. Watch the video and view a slideshow.

We talk with Chicago Tribune reporter Bill Ruthhart about his story detailing business ties between a top aide in Mayor Emanuel’s office and the indicted city comptroller. Read Ruthhart's full story.

The Mayor of Minneapolis, R.T. Rybak, has come to Chicago to invite same sex couples to marry in his city. We talk with him about the unusual campaign, as well as his thoughts about Chicago's mayor.

Five alleged victims have now come forward in a growing hazing scandal at Maine West High School in the northwest suburbs. This latest victim claims he too was sexually assaulted in a hazing ritual led by seniors on the school’s soccer team – a ritual sanctioned by the team’s coaches.

While NASA astronauts were lauded as American heroes, it was up to their wives to present the facade of a perfect family life. In her new book, The Astronaut Wives Club, author Lily Koppel tells the story of the dozens of women who tried to maintain normalcy as the nation scrutinized their every move. We revisit a conversation with Koppel. Read an article and an excerpt.

A festival brings the love to Ludwig van Beethoven. Artists from a dozen countries converge on Chicago for 100 events that celebrate this giant of classical music in surprising ways. Read an interview with the festival's art director and view a slideshow.

We share what you had to say about our panel on Syria and our interview with former Illinois Republican Party Chairman Pat Brady in tonight’s viewer feedback.

The announcement to bring a Whole Foods Market to Englewood has angered some local residents. Paris Schutz explains the controversy, and has more on Mayor Rahm Emanuel's decision to keep Chicago Inspector General Joe Ferguson for another year.

According to new data released Wednesday by the Centers for Disease Control and Prevention, one in four cardiovascular deaths – that is, 200,000 of 800,000 – are completely preventable. What more can be done to save these lives? We gather some leading experts for a frank assessment of heart disease in America. View graphs of data on heart disease.

Former Illinois Republican Party Chairman Pat Brady has a new gig. He is going to lobby state lawmakers to pass same-sex marriage on behalf of the American Civil Liberties Union. He talks about this next chapter.

A $50 million renovation and restoration project for the Illinois Capitol building is nearly complete. But are all the improvements justified given the state’s fiscal woes? We have analysis. Read the project description and historical decisions document from the architect.

The new Art Institute of Chicago exhibition, Impressionism, Fashion, and Modernity, is the first of its kind to look exclusively at the ways in which the Impressionists used fashion to communicate the idea of "modern." View a slideshow and read excerpts from the fashion catalogue.

We revisit a conversation and performance with Cellist Yo-Yo Ma. View a behind-the-scenes slideshow of Yo-Yo Ma's visit to our studio and watch web extra videos.

Having laid out his case for a limited military strike in Syria, President Obama now turns to Congress to authorize his mission. What are the odds of a U.S. strike on Syria, where President al-Assad allegedly used chemical weapons last month and killed 1,400 civilians? And is this strike within American interests after more than a decade of constant war? Elizabeth Brackett and her guests discuss the uncertain path ahead. Watch web extra videos.