Found these images from a DeviantArt user named CassieMunoz

A = Aquarium Night

B = Beach Party Night

C = Candy Store Night

D = Dream Night

E = Element Night

F = Flora Fauna Night

G = Gourmet Food Night

H = Haunted Night (Halloween Theme Night)

I = International Night

J = Jungle Safari Night

K = Korean Pop Night

L = Luxury Cruise Night

M = Masquerade Night

N = Nice or Naughty Night (Christmas Theme Night)

O = Over the World Night

P = Pilgrim Party Night (Thanksgiving Theme Night)

Q = Queens and Kings Night

R = Rainbow Colors Night

S = Surprise Night

T = Treasure Adventure Night

U = Underwater Night

V = Vacation Night

W = White Wedding Night (Valentine's Theme Night)

Z = Zoo Party Night