After updating to 4.7.20, when the Event Info Page is accessed, it generates the following error, "API permission check failed for Event/get call; insufficient permission: require access CiviCRM and access CiviEvent and view event info". If I roll the system back to 4.7.18 it works. Any suggestions on a fix or work-around are much appreciated.
I've confirmed this bug and reported at https://lab.civicrm.org/dev/core/issues/1517
PR https://github.com/civicrm/civicrm-core/pull/16266 should fix the problem.