Why is the party invitation that the family receives a cause for concern?3

Minerva has also found an invitation to one of Trujillo's private parties in her father's coat pocket; it specifically mentions that Minerva should attend. Mama is scared for Minerva's safety, so she insists that Pedrito, Patria, Dede, and Jaimito go along, too. Trujillo is a ruthless womanizer who would punish the family if he does not get the girl he wants.