Note that in order to purchase a 7-day pass you must have a Ventra card. If you don't already have one, it costs $5. There are two versions of the 7-day pass: a $28 CTA pass and a $33 CTA/Pace pass. The $28 pass will suffice unless you want to ride a route numbered 208 or higher -- these routes are mostly in the suburbs although a few do extend into the city. Here are some maps to help you determine what bus and train routes you may be riding.

Note that a 7-day pass is good on buses and CTA 'L' trains. It is not valid on Metra (mostly suburban) and South Shore (Indiana) trains.


Technical details and quibbles:
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If you have a US-issued personal credit card with the Paywave symbol, you can add a 7-day pass onto that and use that in place of a Ventra Card. This can only be done at a Ventra vending machine at a CTA train station. Each person in your party must have their own separate card in order to use a pass.

You can get the $5 Ventra purchase fee credited back to your Ventra account by registering it. To register it, you must provide a real or fake US address and phone number. But I am assuming that you probably won't want the hassle of first purchasing the card, then going someplace to register it, then going back to purchase the 7-day pass.