https://www.cnet.com/news/galaxy-s10-launch-event-wednesday-livestream-how-to-watch-start-time-what-expect-and-more/

You can watch Samsung's livestream here, or just watch it embedded above. 

The 2019 event will be at the Bill Graham Civic Auditorium in San Francisco. CNET will be on the ground to cover the announcements live.