you can get the hats from parties like the April Fools Day party or Festival of Flight
no they are not
You can get pins and hats at parties.
people are not allowed to wear hats inside the church
no
garden gnomes
You can buy home magazines which will often have ideas for parties, and probably garden parties. You could also ask in your local home store or garden centre about garden furnishings they offer that would make your party better.
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Collusion is typically not allowed. Collusion is an agreement between parties, that is often illegal, leaving an unfair advantage to the parties involved.
Another lightweight favorite were Milan hats, made from Tuscan straw grown in Italy. Woven loosely, these hats offered protection from the sun and allowed for good ventilation.
You can overlook your neighbors garden. You are not allowed to go in your neighbors garden physically without their permission.
If you keep chickens in your garden or even let them in the garden they will eat your garden crop.