People should should sing what they like. If the session has no guidance who can complain.

If it is a Singer-Songwriter Session - I guess such a beast exists - then a marathon ballad would make a welcome change. If the Session is "Songs mostly but not exclusively traditional" (Sog my butnet) then songs of known origin are claerly welcome.

People stamping on banjo players is, in my experience, not mentioned in guidance to session. It is worth remembering that a banjo, particularly a damaged banjo could be an appropriate object to wrap around the neck of banjo and banjo player damagers.

Cheers

L in C