One early and constant tradition in Unity has been the publishing of a monthly prayer or prayer service. The format of these services have changed somewhat, but not much. On this page I will share what I know and I will share what materials I have regarding Silent Unity's Prayer Services.
Go here to access Silent Unity's Prayer Services at Unity World Headquarters and go here to access the archives they have going back to 2009.
Here are PDFs of the services for earlier years. Some months are missing, but most of them are there:
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006