Because I intend to watch the press conferences, I made a list of when each conference starts, along with a link to each live stream.

• Microsoft: June 6, 1900 hours EEST / 1600 hours GMT
• Sony: June 7, 0300 hours EEST / June 7 0000 hours GMT
• Nintendo:  June 7, 1900 hours EEST / 1600 hours GMT