It dates back to the early church, when the bishop blessed holy oils used during the sacraments for the rest of the year, and the ritual remains much the same.
Priests that attend get enough sacred oil for the whole year, including for the anointing of the sick, the oil of catechumens — which is for those preparing to be baptized — and the chrism oil, which is consecrated and used for baptism, confirmation and holy orders.
Fr. Dan Belanger, CSV, pastor of St. George Parish and St. Mary’s in Beaverville,
attended the Chrism Mass at the Cathedral of St. Raymond in Joliet, with Fr. John Peeters, CSV, pastor of St. Patrick Parish in Kankakee.
Viatorians also attended Chrism Masses at Holy Name Cathedral in Chicago and at Guardian Angel Cathedral in Las Vegas
The Mass of the Sacred Chrism always takes place during Holy week, prior to Holy Thursday, and it often is the largest gathering of priests in the diocese.