What is the best time to visit toy story mania?

The available sources give no information about an event called "Toy Story Mania". Neither the Disney‑Pixar franchise list nor the Wikipedia entry for the franchise characters mention a specific fan convention, theme‑park attraction, or other scheduled gathering under that name. Because there is no evidence of such an event, it is not possible to recommend a particular time of year to visit.

If a fan‑focused gathering does exist under a different title, typical fan conventions tend to occur in the spring or summer months, often during weekends. However, without concrete details it would be speculative to assert a best‑time recommendation.

In summary, based on the verified evidence, no information is available about a "Toy Story Mania" event or its optimal visiting time.