Alex T⚜️ this is what my "Photos in context" page looks like:

What I am saying is that this does not offer "ADD photos" functionality when viewed from the EVENTS module using:

Events, Photos: 

• (Navigation: Events > View Event Submenu)
• Photos Link calls:   page.php?i=photos-context&profile_id={profile_id}

The button is missing in the Events Module, for the EVENT ADMIN.

Is there anything I can check to make the "+ Photo" button active in Events?

Yes, I've suggested to add simple HTML(or raw) block to this page with such button.