The congresswoman called it "an unapologetic display of the fabric of the people in this country."
"Come Jan. 3rd, Donald Trump and his enablers will be forced to care," incoming Democratic congresswoman Rashida Tlaib tweeted.
Billed as a chance to "forge bipartisan relationships and learn practical skills of lawmaking," the event featured several prominent CEOs.
Tlaib, 42, made history, along with Minnesota's Ilhan Omar, as they become the first Muslim women elected to Congress.
Voters elected the country's first Muslim and Native American women to Congress, in addition to a number of other firsts.
The Detroit native won Tuesday's Democratic primary to represent Michigan's 13th District.