Final answer:
Based on the provided excerpt, there is no information regarding the distance Oscar's nephew walked in the Cerebral Palsy Walk-A-Thon, and it cannot be answered without further context from the text "The Alliance".
Step-by-step explanation:
The question revolves around a specific event referenced in "The Alliance", which is related to Oscar's nephew participating in a Cerebral Palsy Walk-A-Thon. However, based on the provided speech from the second event, there is no mention of the distance Oscar's nephew walked in the Cerebral Palsy Walk-A-Thon in the previous year. Consequently, it isn't possible to provide the exact mileage without additional information from the text "The Alliance".