A notable design element is the the arm adorned by a yukata sleeve. It is meant to represent the celebration of Japanese culture through the Cherry Blossom Festival and the gathering of people from all cultures and backgrounds that the event creates.
There's also the addition of the idea of the "red string of fate" that connects the two hands, also meant to represent the community and togetherness that the Cherry Blossom Festival brings.
Various versions of the poster.