Just got an email from Marriott ... subject "We sent you an email in error, we're sorry."
Inside it says
"We recently sent you an email for Marriott hotels in Boston that did not include enough information for you to reserve your special offer. We are sending this email again along with our sincere apologies and hope that you will take advantage of the great summer specials we are now offering."
Then below it had the data that the original one should have contained.