Story System is a two-day masterclass and workshop aimed at artists interested in developing systems for creative writing using AI, run by London-based artist duo dmstfctn. Taking their upcoming work focused on Commedia dell'Arte and AI as a case study, as well as materials from local museum archives, dmstfctn will demonstrate different approaches to create "story systems" that use AI and Large Language Models to write scripts, dialogues, scenarios, etc. Across the two days, participants will work individually or together to come up with their own "story system", and with support from dmstfctn they will produce a piece of writing.