Film stars James Phelps, Oliver Phelps and Evanna Lynch are slated to appear at “A Celebration of Harry Potter” this week at a three-day event hosted by Universal Orlando Resort and Warner Bros. Among the festivities: a Harry Potter Tribute on Friday night and a Harry Potter Expo featuring panel discussions with film talent and crew. Our favorite: a dueling demonstration with Wand Combat Choreographer Paul Harris. Event activities are included with park admission. Panel event access will be granted on a first-come, first-served basis.