Eco-friendly considerations for hosting a beauty event include choosing venues with sustainable practices, like Sundays Studio and 1 Hotel Brooklyn Bridge, which is known for its reclaimed materials and energy-efficient design. Use biodegradable or reusable materials for décor, offer plant-based refreshments, and ensure that any beauty products used at the event are cruelty-free and non-toxic. Avoid single-use plastics and aim to minimize waste.