How are they going to enforce this? "No officer see this is an orange pi"
Their language here is imprecise and that’s crappy but the intent is clearly to ban little microboard computers, they’re just using “Raspberry Pi” to describe it.
These “bans” are actually just a list of prohibited items at a very specific event. Umbrellas are also on the list.
They said Raspberry PI, but the spirit of the rule is "electronic looking thing that we can't immediately determine the function of". You could probably show up with an unpopulated PCB and get turned away because it's green.
If this expands beyond a single event, I look forward to the inevitable lawsuit, and wish those seeking to oppose such suppression the best of luck.
You could also try American pie, apple pie (Hi mom) or perhaps freedom pi. A decent stars and stripes heat sink should be pretty easy to fiddle up, and probably exists already.