This is from something like the Czech equivalent of Now, called Jim. From my rough translation of the blurb, it's a photo of the highly-secret wedding between the "rocker" (NOT singer), Josef Vojtek and the lovely dancer, Libuše Hůlková. It took place at Průhonice (the garden and castle we visited last month where we marvelled at the ability of Czech women to hike gravel paths in spike heels).
Perhaps at the time we were actually witnessing some bizarre suitability test, akin to those conducted in days of yore when prospective brides would chop down forests with dried herring, crochet bullet-proof antimacassars from spaghetti, line-dance on the head of a pin and so on.
The caption does note that the outfits were inspired by musicals. The Pirates of Penzance and Moulin Rouge are clearly in the mix, but what about the rest?
Edited to add: Lookee what rpc found! It's uncanny, I tell you.