National Rendering Day is observed on April 21 and aims to raise awareness about the rendering industry, which plays a crucial role in sustainability by transforming leftover animal materials and used cooking oil into valuable products. This process prevents waste by converting byproducts into pet food, renewable fuels, and other everyday items, thereby reducing landfill contributions and pollution. The day encourages educational workshops, facility tours, and social media campaigns to highlight the importance of rendering in minimizing food waste and promoting a circular economy. It was established by the North American Renderers Association to coincide with Earth Day, emphasizing the environmental benefits of repurposing materials. Celebrations often include activities that promote understanding of the rendering process and its impact on resource conservation.