When you go on to the official Icebreaker event site you'll find this message
You are hereby invited to a strict black tie auction in a classic mansion in New England. The exact location will not be disclosed prior to the actual date due to the sensitive nature of the items being auctioned. If you wish, a driver can be provided to pick you up in Boston, whereby you will be transported to and from the mansion.
At the mansion you will be treated to beverages and smaller dishes before the auction, which begins at 9pm. After the auction you are free to remain at the mansion and socialise until you feel ready to depart."