As a manager, what do you do to avoid organizational risk “blind spots?”

According to ISO31000 Risk management is a systematic process of risks understanding, evaluating and taking actions to minimize danger and increase profiting. 

Accordingly if a manager followed the systematic approach  noted by ISO31000, there should be no left blind spots unidentified. this can be insured if we defined each context defining the organization and analyzed possible risks influencing it using various methods ( as in stakeholders brain storming, questionnaire, HAZOP or FMEA) in combine.

Make you sure your conduct proper risk assessment and make your approach formal. But this should be not be one time excercise and should be periodically reviewed to identify new risk or re-assess impact of exisiting risks. Continuous awareness with documented risk management will help you to be well prepared