Elmo Cake Decorations Does Everyhing At My Sons 1st Birthday Party Have To Match? He Likes All The Characters?!?

Does everyhing at my sons 1st birthday party have to match? He likes all the characters?!? - elmo cake decorations

My son loves Elmo and Sesame Street, so I party (50 people plane), the decoration is. My son loves Mickey Mouse, Mickey, and my husband ordered his band to sing happy birthday and treat bags! Now I have the settings for Disney, instead of Elmo, because that 1 / 2 hour appearance? Mickey Mouse or may occur Elmo cake?