Blame? How can you blame people for doing something that's not wrong?

Not sure that it is question of right or wrong but one of judgement and individual responsibility on the part of the singer. They must decide when the conventions and consideration of the concerns of fellow session members should take second place to their need to sing.

This can cause tension and the blame for this is due to the singer only. Any blame should not be placed on the Festival or onus placed on the session leader to prevent TOO much singing. Any of this second action would be too little and too late.

The singer has to decide if THEIR first song is adding anything to the session and if any subsequent songs from them are causing needless tension or depriving others. If they go ahead in spite of this - any blame for this is the singer's.

Perhaps someone will answer - why do these singers not go to the places provided - where singing is THE SOLE object and where their singing will cause no tension at all?