Tagging and Associating Photos with Entry Type We have hundreds of photos on our theater website from past performances. In order to sustainably manage the relationship between cast members and which photos they were in, we wanted to explore setting up some type of tagging system. Would there be a way to associating a person (Entry type) with a photo (Asset Type) at the asset level? That way, we could query the database for any photos a person is in from their bio page and assemble them into a slider.
Assets can have custom fields just like entries. You can create an entry field for the person section, and add it to the asset source field layout from your asset settings. 

You can then use relations to query for the right assets or entries as you see fit!