[development] Newbie Drupal 7 - Creating Attendence by user access

Hi, I have list of people who attended meetings who have a drupal account. I wish to - Upload a speadsheet with the attendence - Display to the users which have an account which meetings they attended - These events are not in drupal calendar I have reasonable knowledge of php/html and databases but no knowledge of drupal. Where do I start? (Please be gentle) Thanks, Iain