The thing with Lego is they are like Stern where they are usually acquiring other licenses not lending their own out. Lego like Stern is usually the one using other licenses for their products like Marvel, DC, Star Wars etc.
We tried throwing our son a Lego birthday party at the height of the Lego movie craze. It was impossible to find actual Lego licensed party products. We ended up making most of the decorations and finding generic "building block" decorations.