A Folkopedia discussion group is planned.
The Traditional Song Forum has a discussion group where users broker research information about traditional song. Tradsong Discussion Group During the Coronavirus Pandemic the TSF have been running fortnightly Zoom lectures, recordings of which are available to watch on the TSF YouTube Channel.
The Village Music Project is the basis for the [Tradtunes discussion group] although the discussions are not limited to the manuscripts published by the project.
Melodeon players often discuss matters of interest to them at Melodeon.net. This site hosts some lively discussion and lot of useful information for folks at all levels of expertise.
Anglo-American talk happens at Mudcat
Uk folk/acoustic and roots music is discussed at uk.music folk