A GOOD Singaround should be so advertised , and NOT called A Session
which is a different animal entirely !
Went to an advertised session a while back , and had (Admittedly Competent) performers doing James Taylor songs in C# . As I had been confirmed by the guy running the So Called session that it WAS a session I felt NO Compunction in joining in ! Though C# is NOT my favoutrite mandolin key ! (And NO ! I dont use a capo)

It WAS Fun thugh !