I'm not sure if you mean, can you plan something special or do they just do it? We were there last year for my son's 3rd birthday, my 5 year old excitedly told them when we checked in that her brother was turning 3 that day. They said Happy Birthday and told us we could purchase a cupcake from the Food Court. I had brought candles, but had a hard time finding matches or something to light them with. We didn't expect anything, so there was no disappointment.
Probably you could call ahead and plan something, but I'm certain there would be a fairly steep fee for it.