Each of the ellipses represents an as-yet-unknown category. The three overlapping ellipses form seven regions and one tile belongs to each region. Two have been placed for you - your task is to place the other five - so which go where and why?
I think I finally have a full solution for this one (with a final helpful push from @Retudin in comments to fix one of my category descriptions):
With the ellipses explained as follows:
Top left: Famous fictional wearers of black capes
DRACULA, VADER, ZORRO, VAN BRUNT (the Headless Horseman from the various incarnations of Sleepy Hollow).
Top right: Famous fictional wearers of masks
VADER, LECTER, REID, ZORRO.
Bottom: Famous fictional horse-riders
GODIVA, VAN BRUNT, ZORRO, REID.
These categories would then fully satisfy the title:
Hidden = wearing capes and/or masks;
Revelations... carry on = an allusion to "Four Horsemen of the Apocalypse", people carried upon horseback.