The CTA (Chicago Transit Authority) operates trains (the "L") and busses throughout Chicago and the surrounding areas. Below are some common options, or check out the CTA's Trip Planner for other suggestions.
Purple Line: Gets you around Evanston and into Chicago. Transfer to the Red Line at Howard, or weekdays during rush hour take the express all the way downtown. Purple Line runs north from Howard 4:30 am to 1:00 am weekdays, with service extended until 1:48 am Friday and Saturday nights. The last southbound train from Linden leaves at 1:20 am weekdays and 2:08 am Friday and Saturday nights.
Red Line: For service to and from Chicago transfer at Howard to the Red Line. The Red Line runs 24/7 with the longest wait between scheduled trains only 15 minutes.
Pace is the Chicago area suburban bus service providing bus coverage to Evanston, Chicago, and the rest of Chicago's six county metropolitan area. Going to O'Hare? Take the Route 250 Dempster St. Bus with service from the Davis St. Purple Line station to O'Hare.
Metra is the Chicago area's commuter rail service. Metra provides service on 11 train lines to 228 stations in 6 counties in northeastern Illinois. There are three Metra stations in Evanston, Main St., Davis St. and Central St. all of which are on the Union Pacific North Line with service from Chicago to Kenosha. The Metra can take you to the concerts at Ravinia, or into downtown Chicago in only 25 minutes.