We did Ohanas last year for our son's 1st bday on May 13 and had a great time. We thought it was pretty comparable to Chef Mickey's, but we have only done dinner there. Maybe if you keep trying one of them will open up.
They had a few servers and Mickey all come over and sing Happy Birthday and they gave him a birthday cupcake. We will be at Disney this year again, at CRT actually the day after his bday, so will see if they do anything there for him.