I remember a session that fell on St Patrick day weekend and brought the typical green-beer-and-ham-plastic-paddy crowd. When we were being asked by drunks at different levels of incoherence for different songs, somebody finally asked for Danny Boy. One concertina player played the Londonderry Air which a) appeased the request to some extent and b) re-emphasized the fact that it was a traditional music session and not a soundtrack for drunken lunacy(there are other places for that.

On the subject of a small child at a concert, if the child doesn't care for the music it's unfair to the child and to the audience who came to hear who's on stage. FOr the price of the child's ticket you could hire a babysitter. I volunteer for a folk music society and have even gotten calls like: "Does my child need a ticket if I hold hom on my lap?" So now the poor kid not only is expected to sit quietly but uncomfortably as well.