Asking for trouble

Madge's school is pairing up with Barnes and Noble for a mutually beneficial bookfair. You buy books, present a voucher, and the profits get split somehow between the two institutions.
But the flyer we got in the folder included this:

PS321 Students, Parents and Teachers:
Come read your Pandamonium poem, or any poem you
like, at our first 321 OPEN MIC NIGHT
and
Barnes & Noble
Bookfair

I can just see some dad, dressed in requisite black, smelling of frankincense and myrrh - or maybe just cigarettes and gin - going up to the mic and saying:
Here's a little something I wrote, called "Full Custody, My Ass."

The kids will love it.