Greetings from the Mists! We’re happy to announce that the fourth beta event for phase one of the World vs. World World Restructuring feature will take place from August 12 through August 19.
You must select a guild to play with for this beta event. The in-game panel found in the WvW menu that allows you to select a WvW guild will be available on August 2. You must make your guild selection by 11:59 p.m. Pacific Time (UTC-7) on August 11 or you may be matchmade as an individual for the beta event (i.e., you and your guild will be placed on different teams).
https://www.guildwars2.com/en/news/wvw-world-restructuring-beta-4-begins-on-august-12/