Sources of Information
The primary sources of information relating to a venue would likely be the service providers website, a recent flyer/poster/advert for a service or direct contact with the providing organisation.
Timeliness
See the Preferred for providers , , and : Engagement via their preferred method is likely to yield the most accurate results. Check the cadence on the assurance to establish when each venue should be assured. A google search may be useful, especially with shared/hired venues. Accuracy, Relevancy, Consistency, Completeness
The following are a series of questions that should be asked of each piece of data.
View of Venues Data Dictionary