INGLEWOOD, Calif.–(BUSINESS WIRE)–Doors open today as thousands of Call of Duty® fans gather in-person, and millions more join online for the biggest celebration of the largest gaming franchise in the world, as Activision Publishing, Inc., a wholly owned subsidiary of Activision Blizzard, Inc. (Nasdaq: ATVI), presents Call of Duty XP, taking place at The Forum in Inglewood, Calif., today through September 4. The epic fan-celebration is jam-packed full of must-see events including the culminat