Here is the schedule of the conferences.
The Witcher 3 - June 5th, 11:00 PDT/14:00 EDT/15:00 BRT/18:00 UTC/19:00 BST/20:00 CEST/22:00 MSK/02:00 CST/03:00 JST/04:00 AEST
Microsoft - June 9th, 09:30 PDT/12:30 EDT/13:30 BRT/16:30 UTC/17:30 BST/18:30 CEST/20:30 MSK/00:30 CST/01:30 JST/02:30 AEST
Electronic Arts - June 9th, 12:00 PDT/15:00 EDT/16:00 BRT/19:00 UTC/20:00 BST/21:00 CEST/23:00 MSK/03:00 CST/04:00 JST/05:00 AEST
Ubisoft - June 9th, 15:00 PDT/18:00 EDT/19:00 BRT/22:00 UTC/23:00 BST/00:00 CEST/02:00 MSK/06:00 CST/07:00 JST/08:00 AEST
Sony - June 9th, 18:00 PDT/21:00 EDT/22:00 BRT/01:00 UTC/02:00 BST/03:00 CEST/05:00 MSK/09:00 CST/10:00 JST/11:00 AEST
Nintendo - June 10th, 09:00 PDT/12:00 EDT/13:00 BRT/16:00 UTC/17:00 BST/18:00 CEST/20:00 MSK/00:00 CST/01:00 JST/02:00 AEST