Red Mass (annual prayer service ahaed of Opening of SCOTUS term) - September 30, 2018, 10 a.m. - Noon

Host Church: St. Matthew the Apostle Cathedral (Roman Catholic), Washington D.C.

from information at "Faith and Action" dot-org:

The Red Mass is a special service. This service’s primary purpose is praying with and for members of the judiciary and anyone engaged in the law, including attorneys, legal advocates, paralegals, justices, and judges. The Justices of the U.S. Supreme Court attend this church service together. The importance of our presence and participation at the Red Mass cannot be overstated.

http://www.faithandaction.org/event/red-mass/