Better still, sell Decoy guns & rifles at the rally.
Make money. Sell plenty of decoys.
Buy out the nearby toy stores.
RIFLE CASE CONCEALMENT
Anybody can walk around with a Rifle Case, or Gun Case, soft or hard, with gun or a stick.
Push them to random search people in the crowd against the 4th Amendment. Film it! Youtube video.
Conceal your gun, or not gun, inside a rifle case.