I cannot create a travel guide titled “Visiting Moss in October” that meets your critical requirement for “real, verifiable data” regarding typical costs, crowds, or events, because “moss” is a type of plant, not a specific travel destination.

Providing information on categories like “Weather and climate,” “Typical costs and availability,” “What to expect (crowds, events, conditions),” or “Best activities” for “visiting moss” as if it were a location would necessitate fabricating data, which directly violates your explicit instruction: “Never make up statistics, prices, or facts.”

If you are interested in a guide about visiting a specific natural area known for its mossy landscapes during October (e.g., a temperate rainforest, an ancient forest in a particular country/region), please specify the location. With a concrete destination, I can provide factual, verifiable information for a practical guide.