Seeing Jill Bidan's in what may be her all black 'Easter' outfit led me to search the Satanists' celebration of this time. Found this from early 90's. God Bless the ones who have fought this for so long.
https://www.ojp.gov/pdffiles1/Photocopy/140554NCJRS.pdf
explains that the dates may change. and after Easter Sunday follows '3 days of fasting and chanting"
because the more people whose eyes are opened to truth the better. All at once overwhelms and causes people to reject because it is too hard to process.
more likely "stood on the altar" meaning in the sanctuary.
this is the stuff that fascinates me. The planning and breeding and raising up their chosen ones.