This was in Lincoln, Nebraska on January 17, 2015.
Stevie Nicks says this hasn't happened in 40 years. Mick was ill and couldn't finish the show so they ended early with Steve The Drum Tech sitting in on Go Your Own Way followed by Christine singing Songbird.
The part of the show we got to see was great. Get well soon Mick!
http://journalstar.com/entertainment/music/mick-fleetwood-illness-cuts-fleetwood-mac-concert-short/article_695a2096-e9da-5ad1-9f53-c3468648fc3d.html
My second most popular concert video: https://youtu.be/E4n5qS_x0fI