The conference organization itself announced this with a post on his official website.
“After a series of close consultations with our partners in the gaming entertainment industry and with the community around the world, we made the difficult decision to postpone the Game Developers Conference scheduled for March. Having spent the past year preparing the show together with our advisors, speakers, exhibitors and event partners, we are very disappointed and sorry that we cannot host you this time. We want to thank our customers and partners for their support, comparisons and encouragement. As everyone has reminded us, great things happen when the community joins and gets in touch with the GDC. For this reason, we have every intention of holding a GDC event this summer. We will work with our partners to determine the details and share more information about our plans in the coming weeks. "
The GDC 2020 was initially scheduled for March 16-20 and was to be held in San Francisco, California, but the numerous defections recorded in recent days, had questioned the smooth running of the conference.
Now, however, the official has arrived: lit is postponed to GDC 2020 and will probably be relocated to next summer.