Hey Steve,
Thanks for reaching out to us!
I’m not sure I’m following exactly what you’re looking for but hopefully I can give some information that will be helpful.
Depending on the number specific locations you’ll need, you could try using the Event Categories to control the locations. You could then link directly to calendars for specific locations based on these category archives. Additionally, our PRO plugin comes with a map view that you could add a location to when linking by adding a query string to the URL to pass the desired location.
You won’t necessarily need to use Multisite but it is an option and a “master calendar” could be created on a main install pulling in content from all sites but this is something that would need to be custom developed.
Let me know if this helps.