Go to the festivals page, find your area and sign up to take part there. You will get a confirmation email from your local organiser.
See your local festivals page for details. Sometimes local festival organisers ask for a small amount of money to cover costs or raise money for charity.
Absolutely, in fact higher up windows are easier to view from the street.
You can, but without your address on the map, people won’t know to come and see your window. By signing up you are helping your organiser to gauge interest too. Your name or email will not be shown on the map – just the address.