I'm trying to figure out a good potato salad for my dad's 70th birthday party. He's serving burgers, so I want something that goes well with them. I don't make it often, so I'd love to hear any favorite recipes or tips that could give it a little extra something. Also, any thoughts on keeping mayo-based salads cold at an outdoor gathering? I'm starting to feel like I should just go with store-bought instead. Any help would be appreciated.