Final answer:
Casca reports to Brutus and Cassius the events that occurred during the Lupercal games in Shakespeare's play 'Julius Caesar'.
Step-by-step explanation:
The report of what happens at the Lupercal games in the play "Julius Caesar" by William Shakespeare is relayed to Brutus and Cassius by Casca. Casca describes how Caesar thrice refuses the crown offered to him by Mark Antony, showcasing Caesar's cunning manipulation of public perception. Brutus and Cassius then use Casca's information to further their conspiracy against Caesar, displaying early signs of their opposition to his rising power and the pivotal role public events play in the political machinations of Rome.