I created the Exhibit Galleries page and the link to it by adding a Custom Page User Item. I added four Exhibit Gallery User Items to create the galleries and the links to them. Those User Items were dragged into the Custom Page User Item so that they are logically "inside" it.
I also added two Heading User Items to the Exhibit Galleries Custom Page, one to add the "Unfiltered" heading and one to add the "Filtered" heading. Heading User Items are intended to help split Custom Page content into subsections.
The All gallery includes all image exhibits, and the rest are filtered subsets.
The user can define as many galleries as desired. The filtering options vary for person exhibits, event exhibits, etc. All exhibits can be filtered by the text in the exhibit caption or description.
The text above is in the Main Content field of the Custom Page User Item.