This one seemed a little sketchy, so I tried it today to confirm it works prior to posting.
Basically Microsoft is trying to bribe you to use Mixer. Make a mixer account, link it with your Microsoft/xbox account, and watch one of the three remaining live shows over the next three days. You'll get Rare Replay (30 games from the xbox 360, n64 snes and nes), two indie games and a bunch of dlc to popular games added automatically to your download cache. For some people these are going to be during work hours, but you don't have to watch them on your xbox, the mobile app or website works as well.
More details can be found here:
https://slickdeals.net/f/10237920-xbox-e3-mixpot-digital-games-dlcs-rare-replay-xbox-one-free-more-w-linked-microsoft-to-mixer-account?src=featured-cat Anyone interested better take a look at the schedule now as you only have a couple more days to sign up. Myself I just went to the address and muted my computer... it loads the stream automatically once the event is live.