Hey y'all. I'm back with more lighting design!
Vamp '69 contains a classic Xenon Trouper (seen below), which is the spotlight that inspired the song Super Trouper.
Vamp '69 Trouper
However, AFAIK, there is no real scare-actor access to the Spotlight Stand. That's where the fixture hung from the platform fits. The fixture is another ellipsoidal, albeit one with a 10 degree lens. This would pull a tight beam (not unlike a spotlight) on the performers at Music Fest '69, without requiring a live spot technician to stand up there.
On the other hand, as I've not seen the fixture in person, the spotlight could be physically used, and the ellipsoidal below could be to light up the Oddfellow Symbol on the back curtain of the main stage.
See y'all in the fog!