The combination of princesses change, although Cinderella is usually a given to greet. Belle, Aurora, Rapunzel, Ariel, Snow White are common in the mix to meet. Sometimes the mice join. Also usually one prince of one of the princesses mentioned. They do a little dance and come by the tables.
Besides the princess pavillion it is the only guaranteed place to meet princesses. Sometimes a princess can join Sunday brunch in the hotel and sometimes there are scheduled meets on the entertainment programme, but not as a fixed position.