Shoebury Beach

I’ve seen this before and think it is some sort of religious ceremony and would love to know more if any of you can enlighten me as Google has been no help. These women were on Shoebury beach when the dawn light was first appearing on the eastern horizon and were there when I left with the sun in the sky. They rang their bells, shook their shakers and sang in what I think was a Christian orientated way, but I may well be wrong. Either way, their dedication has to be admired on a breezy October morning!