It never hurts to be prepared. Nintendo of Japan has already put up its YouTube live event page for the Nintendo Switch presentation. You can even set up a reminder to be notified when to tune in. Go here to check it out, or press play below.
Keep in mind that this specific stream will most likely be completely in Japanese with no subtitles. The U.S. Nintendo YouTube page will most likely offer up subtitled or dubbed video in English. We will keep you updated as we learn more.