I've got some ideas. Adele might wanna take notes.
* Starts with eveything dark and suddenly I bright light shines over her after she sings Hello's first two verses.
* After she ends the first song, she sings Set Fire to the Rain while (at the end) it starts raining sparks over her
* Dancers come to perform Rumor Has It/Someone Like You with Adele doing that thing she does with her arms when she sings uptempo songs (w/ Amber Riley and Naya Rivera

)
* Skyfall with an Orchestra and an amazing projection on the floor, like they did with Katy Perry
* Close with Rolling In The Deep, slaying those acapella vocals and making the crowd sing along. Adele flying over the stadium wouldn't be a bad idea tho