Council Calendar

in our site tree we have a few module interfaces set up already. Where will these display on the website? And if we need to make landing/subpages with that content, how do these already set up module interfaces get used by those subpages? For example: parks. These are currently in our mega menu navigation. A content module interface is also already set up in the new site tree. To avoid double work, do we need to set up a new content module interface on the relevant subpage we build for parks (if that is where we want to house the content), and only use that module? Or is there some advantage to using the already set up parks content module interface in the site navigation? And if so, how/can we get that to display on a subpage?