Designing Lyft for large parties would involve creating a new feature that allows users to select a larger vehicle that can accommodate more passengers, such as a van or SUV. This would require working with Lyft's engineering and operations teams to ensure that these larger vehicles are available in areas where there is demand for them. Additionally, the app would need to be updated to allow users to specify the number of passengers in their party and to see the price and availability of larger vehicles. It would also be important to consider the user experience of booking and riding in a larger vehicle, as well as any additional safety considerations that may arise. Overall, designing Lyft for large parties would require a strong understanding of product sense and the ability to collaborate with cross-functional teams to bring the feature to life.