Just in time for E3 2019, Xbox has launched their events app for fans to keep track of all the latest news releases, live streams and alert notifications of big news announcements. According to the description the app will also be updated with events like X0 and Gamescon presumably after E3. The app is available for both Android and iOS devices but offers very little in terms of functionality right now since we are days away from E3 but during the event users will be able to keep track of all the Xbox briefings and events while also receiving notifications of breaking news.
Xbox has been hinting at some big news announcements so this should be a perfect time to download the app to be prepared. E3 2019 takes place June 11th through June 13th but Microsoft is having their press briefing on Sunday June 9th at 1pm PT / 4pm ET which will be live-streamed via the app as well.