How about this instead of signs:
For the next game, map out a few sections of seats and just hand out blank sheets of white paper. When these signs are held up, they spell "FIRE PIOLI" in large letters. This is a large undertaking that I don't really know how to do, but I don't think you'd have to do a million seats or anything to make it visible.
The plus side is that they can't confiscate blank paper, and it's a really visible contrast against empty red seats to see that message that large.
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