Nintendo has planned a week of activities at E3 this year.
The headline showcase at the event will be Super Mario Odyssey. Attendees will get to play it on Switch and also sample some other Switch games. There will be a Nintendo Spotlight E3 2017 presentation that will have new game announcements. For the tournaments side of things, there will be livestreams of the ARMS and Splatoon 2 tournaments that are taking place on the show floor. As expected, Nintendo Treehouse will return live at E3 to showcase upcoming Switch and 3DS games.
Source: God is Geek