For Nintendo, the Zelda stream kicks off Tuesday, June 14, 9 a.m PT / 12 p.m. EST. The Nintendo Treehouse broadcast, where they'll be playing demos of some already announced games, is the following day, but I'm not sure of the time. Then the Pokémon event, I believe, is the day after that, but again, not sure the time. I believe June 14 is the very first day of E3.