The 2026 Category Theory October/Novemberfest will be held on the weekend of October 31st through November 1st. The meeting will be virtual. (Links will be provided soon.) Following the tradition of past Octoberfests, this is intended to be an informal meeting, covering all areas of category theory and its applications. Talks by PhD students and young researchers are particularly encouraged! If interested in speaking, please send title and abstract to Rick Blute at rblute@uottawa.ca<mailto:rblute@uottawa.ca> by October 15th.