Twitch Rivals is an event stream. They do one-day competitions pitching Twitch streamers against each other, often in games they're not expert with. Twitch handles the production including organization, scoring, and a pro host with guest analysts.

The beauty of this event is that you can watch the main broadcast and get an overall idea of what's going on, and/or you can watch individual streamers as they compete. Twitch Rivals recently did a chess hand and brain match and I watched (live) from one streamer's perspective and then watched the VODs for two other streamers and the main Twitch Rivals broadcast. The main channel was also doing two video streams so you could switch to the current scores (on mobile) or even have both videos showing (on desktop).

This is one of the few things Twitch can do really well. Most e-sports events either have the players there and you get just the main feed or the players are distributed but often not streaming themselves.