Is this a new phenomenon of re enacting a different period in time? Or, did people in the middle ages re enact the ancient times?
There's a lot of stuff that's attributed to "ritual" and "religion", but I believe a lot of that is simply entertainment. Aristotle wrote in Poetics of Greek epics being unnecessary spectacle, which makes The Odyssey sound like The Avengers of the era. 3000 years from now, people will talk of Batman worship. The animal headed deities of the ancient era could just be a furry thing.
Also take note that Ancient Greece and Egypt lasted for a very long time. By Cleopatra's time, the Pyramid of Giza had been around for over 2000 years. It could well be that they did reenactments back then too.