1. Katy Perry will perform her latest album, Witness, at the United Center tonight. Tickets for the 7pm concert are still available, starting at $21.
2. See a screening of the famed French film Persepolis at the Gene Siskel Film Center tonight at 6pm. Tickets are available for $11.
3. Part two of the MCA's 50th anniversary exhibition "You Are Here" opens today. The museum is open from 10am to 9pm today, and admission is free for Illinois residents.
For more events, check in with Time Out throughout the day.