The immunities and special protections that the Illinois General Assembly granted to public entities in the Local Governmental and Governmental Employees Tort Immunity Act — including a section that shortens the usual two-year deadline for negligence claims to one year — extends to “any not-for-profit corporation organized for the purpose of conducting public business.” Relying on the one-year deadline, the Chicago Zoological Society — a not-for-profit corporation that operates Brookfield …