On the Field Museum in Chicago’s website it says: Illinois teachers (pre-K through 12) and active military personnel receive free Basic Admission which can be applied to any admission package. Please show proper identification to any Guest Relations Representative to take advantage of this benefit. Please call if you have additional questions.
On the SHEDD Aquarium page it says: Educators from Illinois, Indiana, Michigan and Wisconsin can visit Shedd free by registering for a pass online. If you’re outside of our four-state area but would still like to learn more about connecting your curriculum to the living world, you can receive $3 off admission to Shedd by showing a valid school I.D. or current paystub at a cashier station when you buy your ticket. Info listed here.