Looks like the CSS hasn't loaded, leave it a few more seconds and it will look fine.

Triggering a window re-paint seems to correct this: resize the window, toggle the embedded developer tools window, etc.

Resizing the window and trying to scroll causes a lot of scrolling bugs as well.

Microsoft could do a much better job managing their vendors who create these sites for them to render well cross-platform and responsively.

This one looks decent on Chrome mobile with the photos going edge to edge with no margin, but the site for the event at http://www.microsoft.com/october2015event/en-us/live-event looks pretty amateur hour on Chrome mobile on my Moto X: huge margins and padding that result in text paragraphs with two words per line.

Same here on Mac/Firefox.

Linux/Firefox too. Eventually the pictures load. Wonder how it's looking on edge?

Same in Safari on iPad (ironically enough).