Perhaps simply wearing a Lindsey T-shirt is the way to go for any Lindsey supporter who finds him/herself at a concert with a non-refundable ticket.
I remember, back during the SYW tour, some fans who were (rightfully) angry at the man who ran the fan club, Jonathan Todd, wore T-shirts denigrating him as well as the fan club. "FIRE JONATHAN TODD" was the theme, but there were several variations. They were noticed... albeit there was no indication that the BAND actually saw them.
ETA: I dug up the thread:
http://ledge.fleetwoodmac.net/showth...p?t=9797&pp=15