Aulai Darshan occurs in the evening in the Radharaman Temple, around the time of Sandhya Aarti. The mood is that Shri Krishna has just returned from a long day of herding cows. He freshens up, changes His clothes and wears His loungewear. At this time He is very hungry and waiting to eat. So, Mother Yashoda tells Him aulai, "I am bringing."
Radharamanji is a moveable Deity; He is small, light and not mounted on a surface (like most Deities in other temples). When He is sitting on His throne at a height, He may fall if we place a flute in His lotus hands or if we remove it from them. We also have to remove and replace the flute every time He eats His meals ( bhog), which again could result in His soft hands getting scratched and Him falling over. Instead, we meditate that He is holding His flute so that He has it with Him always.
For the love of Gopal Bhatt Goswami, Shri Chaitanya Mahaprabhu appeared as Radharaman. Chaitanya Mahaprabhu is the joint Incarnation of Radha and Krishna. The ancient Deities of Vrindavan had Names like Govind, Gopinath and Madanmohan, but later when Shri Radha's Deities were installed in those temples, they became known as Radha-Govind, Radha-Gopinath, Radha-Madanmohan, and so forth. But Shri Radharaman Dev is Radha and Krishn in a single Form, non-different from Shri Chaitanya Mahaprabhu. There is no separate Deity of Radharani with Him, however the Holy Name of Radha is worshipped at His left side, in the same manner a three-dimensional Deity would be.