Nick,

A grand (mahA) imagery. The cost of the elaborate head gears will be written off by sponsors too!
Are women rasikAs being thought of? T shirts, caps...We may stick out like sore thumbs attracting unwanted attention. Srini is right about it. A wrist band is a good idea, a simple badge too, which can be printed out, and we can wear them while we enter and exit a hall. If you have it on all the time, Nick, listen to this: with loud tALam/talk prone neigbors, we will end up with their asking us 'during' the concert, why we are wearing such a thing, what does it signify, and continue relating whatever we say to neighbors, and they to theirs.
I have done the following: look out for rasikAs I know as I arrive, again when I leave the hall. If I happen to see one 'during' the concert, I wave, so that if they have a minute after the oncert, we are bound to say hello, and introduce the ones we know to others.
Best of all, have three sessions or more, announce them on the forum and make it to at least one of them. Mornings or early afternoons are the best for meetings. If there is a jam session, after ten at night!