Fleetwood Mac has had to cancel their concert dates in Australia and New Zealand. Reports state that John McVie, one of the founding members, was diagnosed with cancer and will be undergoing treatments at the time the concerts were originally scheduled.
This report at CBS news: http://www.usatoday.com/story/life/music/2013/09/26/christine-mcvie-joins-fleetwood-mac-in-london/2876709/ states that Christine McVie appeared with the group when they performed Don't Stop.
Youtube video has appeared of the concert, including the rendition of Tusk that was performed in London. Remarkably, you can see Trojan Marching Band backing up Fleetwood Mac when the band played classic original footage of the Dodger Stadium TMB/Fleetwood Mac video.Here's the Youtube link:
A fan shot video of the concert by hand and posted it on Youtube. You can see TMB behind the band in a portion of the screen at 2:24 seconds into the song. It's remarkable testimony to the longevity of Fleetwood Mac that they can fill concert halls to this day. It's also fantastic testimony to the history of Trojan Marching Band and Dr. Arthur C. Bartner's legacy that the band is using the footage in present concerts.