Think of it this way: you can wear a silly hat anywhere you want. What effect would it have on silly hat population if you explicitly invited people to wear silly hats on your island?
But anyways, why does it matter? Will my silly hat experience not be as good if other people aren’t wearing one? I’m wearing for myself.
A designated place matters for the experience: you can expect that the door frames and ceilings will be adjusted to accommodate your hats (i.e. no one will require a phone from you to do basic things).
You may also expect other people to already be in the same mental space as you, or learning to see the world from a new perspective at the same time as you are.