If you're talking about the Pat E Cake Birthday Party......I'd use my money to do something else. We did this for our 8yr olds birthday & him & our 4yr old daughter didn't enjoy this. The host does a song or two, not necessarily getting anywhere close to where you're sitting, you decorate a dry cake with vibrantly colored frosting (that stains the skin as well as clothes), Mickey & Minnie come out for a quick song, a conga line & then for photopass pics. They will not sign autographs!!
For the price that you pay for this party, you could go to a character meal, where you'll get a full meal & tons of character interaction (and autographs if you want them)
Some people really liked this party, but we were very disappointed in it. The host never got anywhere near our table, the kids wanted to see Mickey, but were rushed thru to get everyone thru the photo line. My daughter spent the rest of the trip with a red eyebrow & we ended up with a vibrant blue stain on a tshirt.