Importing existing Squarespace events to a new events page?

The normal way to do this is to place all the events on a single calendar first and add tags or categories to each event so that you can create views/pages that filter the events to show the different regions of the state - so the opposite of what you are doing now 🙂.

This is because Squarespace has a built in filter feature that can limit the view but not a way of joining or aggregating different events collections. 

You can usually move events from existing collections into one using the Move button.

However, there is a third party tool available to Sync Collections.