Arthur couldn't sleep after his conversation with Aria about their future. He wondered about how his actions and mere presence could put people like Josephine and Oliver in danger.
He also pondered how he had been so ready to kill Eliza to defend his friends without knowing her or understanding her true intentions.
Although killing everyone in his way seemed like a solution to avoid problems, it might also be what causes the most problems.
So, he waited for the party, not to find a reason to kill Eliza but perhaps to find a way to prevent future problems for his friends before leaving Lakeview.
While everyone was having breakfast together, a messenger from Eliza arrived at the mansion and handed a letter to Josephine, who read it immediately.
"It's a formal invitation from Eliza," she commented. "The party will be at Lakeview Palace…"
"Where is that?" Arthur asked curiously.