On February 18th, 2025, Guerrier founded International Worldbuilding Day—an annual global observance celebrating radical imagination, speculative storytelling, and worldbuilding as both a vital creative practice and a transformative ontology. Born from a imperative to show that many worlds are truly possible, this annual day mobilizes people worldwide through dynamic in-person activations, collaborative worldbuilding, and collective dreaming aimed at architecting new human systems. International Worldbuilding Day expands upon the groundbreaking Collaborative Worlds Art Movement—originally sparked by the 2023 Syllble manifesto—which declared that the future of storytelling is inherently collective and that shared universes, such as the ever-expanding Sauútiverse, serve as essential testing grounds for the realities we wish to inhabit.
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