They’re proud that former President Barack Obama was giving a speech at their get-together, but they didn’t want anybody to talk or post on social media about it.

In a bizarre demand, the MIT Sloan Sports Analytics Conference apparently called for attendees of Obama’s speech, which took place inside the Boston Convention and Exhibition Center, to keep it a secret.

“The 44th President of the United States, Barack Obama, will address the 2018 Sloan Sports Analytics Conference on February 23, 2018 at the Boston Convention and Exhibition Center,” a description of the ESPN-sponsored event says. “A lifelong sports fan and athlete, President Obama will address a wide range of subjects in his talk, from his most memorable moments in the White House, to his post-presidency plans.”

But attendees and members of the media were given a policy that requires them not to talk about it.

Others posted photos before the event, showing the crowds waiting to get into the room.

Officials with MIT and the conference did not respond to a phone call and emails requesting comment and an explanation of the policy.