How do I run a report for an event
The best approach depends on what you intend to do with the list, but generally speaking you'll use the Reports menu as follows:


In the CiviCRM menu, click Reports menu » Event Reports.
Select Attendee List.
Click the Columns tab.  Check the box next to Email and Current Employer (and anything else you need).
Click the Filters tab.  In the Event box, select the event(s) you want a report on.
Click the View Results (or Refresh Results if you already pressed it once).