Although Mike didn't elaborate on why Sammi didn't go, we can only assume her absence had something to do with Ronnie Ortiz-Magro and Jen Harley's presence.
As many "Jersey Shore" fans (and even non-"Jersey Shore" fans) know, Sammi and Ron had one of the most tumultuous relationships in reality television history during the first go-around of "Jersey Shore." Although not confirmed, many people believe that's the reason Sammi chose not to take part in the series' reboot, "Jersey Shore: Family Vacation," which has heavily documented Ron's new relationship with his baby mama, Jen.
Mike and Lauren wed before he heads off to prison to serve an eight-month sentence for tax evasion. At the time of his sentencing, Mike's lawyer said his client was "looking forward to marrying his college sweetheart ... and moving forward together after he serves his sentence."