Here's what's happening this weekend in Chicago

This weekend, cheer on runners during the marathon, watch Harry Potter live and explore STEM careers and opportunities.

1. 🏃 Bank of America Chicago Marathon

The marathon welcomes athletes, everyday runners and fans!

What to expect: Thousands of runners will complete a 26.2-mile course this weekend followed by a post-race party. Missed the deadline? Cheer on participants along the course or from the comfort of your home .

• Expect more traffic than usual and many street closures.

Fun fact: Many participants, including Miss USA, Alma Cooper , will run for a cause. See this year's charity partners .

Alumni runners Randy Burt, 76, George Mueller, 76, and Henry Kozlowski, 74, are the only runners who have successfully completed all 45 previous Chicago marathons, according to organizers.

What they're saying: "In the early years, we tried to improve our finish times, now the finish time is not as important as making sure we successfully cross the finish line," Burt tells Axios.

When: The race will begin at 7:30am Sunday and activities will end at 4pm.

Where: Grant Park

What's next: Entry for the 2025 Bank of America Chicago Marathon opens 10am Oct. 22.

More things to do this weekend in Chicago

2. 💰 Building Wealth Today

• Attend this one-day financial summit hosted by the Chicago Treasurer's Office. Network with community members and take part in workshops 10am-5pm Saturday at UIC Forum. Register for the free event.
• Celebrity guests include Keke Palmer , Mathew Knowles and Larenz Tate .

3. 🪄 " Harry Potter and the Cursed Child "

• Watch Harry Potter and his friends navigate adulthood in this live theatrical performance. The show will run until Feb. 1 at the James M. Nederlander Theatre. Tickets start at $75

4. 🧬 Science Works

• Roll up your sleeves, network and explore STEM career opportunities 9:30am-2:30pm Saturday at the Griffin Museum of Science & Industry . There will be speakers and interactive activities. Free
• If you go: Attendees will also receive a free ticket to the museum.

5. 🚘 Slow & Low

• Attend this lowrider festival to view hundreds of custom cars, modified motorcycles and bikes 10am-8pm Saturday at Navy Pier. Tickets start at $15