I just found this -

There are 8 primary holidays in witchcraft and Satanism. In the Illuminati they are known as the 8 nights of human sacrifice for obvious reasons. There are four major and four minor ones:

1) Candlemas or Imbolg -- Feb. 1,2- major 2) Ostara- March 21 (Spring Equinox) - minor 3) Beltane or Roodmas - May 1 (founding day for the Illuminati in 1776)- major 4) Litha-- June 21 (summer solstice) - minor 5) Lughnasadh or Lammas- August 1 - major 6) Mabon- September 21 (autumnal equinox) - minor 7) Samhain or Hallowe'en- October 29-31 - major 8) Yule- December 21 (Winter solstice) - minor

from -
http://watch.pair.com/lahaye.html

Maybe check the dates against music performances at Comet Ping Pong.