Uninvited jerk almost ruins Charlotte Sins' Memorial Day party

Charlotte Sins's Memorial Day party is hours away, but an unwelcome guest has already arrived: her boyfriend's coworker. He claims he never received an invite, yet insists on staying despite Charlotte's blunt declaration that he wasn't invited due to his rude behavior towards her boyfriend. Now, Charlotte faces the challenge of getting rid of him before the real party even begins. What tactics will she employ to make him leave?