Hilary Knight at home, photo: courtesy Douglas Elliman How’s this for a milestone? Eloise, the character illustrated by East Hampton’s Hilary Knight, is turning 60 this year. Of course, she still looks like an adorable little girl running around the Plaza Hotel. Knight is celebrating this anniversary in a big way. The beloved writer and illustrator, who recently listed his home at 1 Squires Path in East Hampton for sale, is going to have a book signing, open house and estate