Here's what the Mall of America website says about it:
Join us each Saturday in May for the Big Time Bash! Watch your favorite episodes of Big Time Rush, show off your singing voice at the BTR Sing-Along and Dance Party, pose for a photo, enter to win prizes, and much more!
The live video chat with Big Time Rush will take place Wednesday, May 29 in the Rotunda and five lucky fans will have the opportunity to ask the boys a question. Here's the details from MOA:
We are hosting a live chat with Big Time Rush! Head to the Rotunda to watch the chat, pose for a photo and more! Five fans will be chosen to ask a question during the video chat. Go to Facebook.com/NickUniverse for more info.