MOSAIC at Vanderbilt University

Hey there! I just received an invitation to come to the MOSIAC program at Vanderbilt. The invitation came by email, and apparently there’ll be a packet in the mail soon with more information.It said most of my expenses at the event will be paid. In the meantime, can anyone tell me what this program is about and why I received it? Does this mean that my RD application is likely to be accepted?

For a little backstory, I applied RD to UChicago and received a likely letter and an invitation to their fly-in program, Destination UChicago, about a month ago. I also received a likely letter and an invitation to Washington & Lee’s fly in program a week ago. I was deferred from Harvard Early Action. I am a legacy at WUSTL, and my mother has been faculty at WUSTL for 17 years. I applied there RD, as well as to a lot of other T20 schools.
I am a URM.

Thanks!!!