I'll repost my comment from the Cosplay article, because of reasons:
The video of Mark Meer as Shepard led me to this site
These people are trying to get as much of Mass Effect cast as possible to cosplay their characters, preferably at the same time and place. And they're succeeding! Mark Meer, Jennifer Hale, Rana McAnear and Raphael Sbarge, among others, are already on board.