One of my favorite aspects of the GPN fandomship has been the diversity in the ages.  I have met GPN fans who are younger and older, yet our shared passion swiftly hurdles any age barriers.  
     I prefer to take in a show through all five senses - seeing the musicians and the lights; hearing the drum beats and the harmonies; smelling the excitement [and sometimes the "puffs"]; feeling the love in the hugs from the good folks who are friends; and tasting the sound of lyrics as they slip out of my mouth - so I prefer not to talk or even take pix!!!
Being in the moment really resounds, for me, at a GPN show.  Like gracefan, the spell is often broken when I get bumped or when I can't see the stage because an iPhone is recording the tune.  But this is me, not everyone.  [And when you can't get to a show, it sure is nice when some of the videos are posted!]
     So, a balance would be extra nice - some pix taken, some screams given and some between-songs-chatting.  Did Emily Post ever cover concert behavior???  Finally, maybe some of us geezers can set some good examples?