Thanks to all who have responded to my query so far. Mike Miller's advice is very helpful, and Animaterra, I will look into Nick Paige's guide. Does Pete Seeger have anything in print about leading songs? Has there been anything in Sing Out over the years?

The choir that I referred to is called Common Thread: Community Chorus of Toronto. We took our name from Pat Humphries' terrific song. Common Thread is a non-audition seventy voice choir with a diverse membership, now in its' fifth season. We sing for social justice, community, and the love of making music with others. About half of the songs that we do are in languages other than English.

The chorus gives a small number of concerts each year, some of which are in support of a variety of organizations or causes. We rehearse weekly, sometimes more often, and a short amount of time is taken at most of our rehearsals for a singalong session. In addition, we get invitations from the community to lead singalongs at a variety of events. We encourage that type of invitation and CT members who are interested and available attend the events.

It is leading the weekly singalongs and singalongs in the community for which we want to improve our skills, and it is for that reason that we are holding a workshop in the new year. Of course, we are always open to good songs that are not on our list, but it is not new songs, or song books (we are very familiar with Rise Up Singing), I am asking about here.   

Any further suggestions?