Kumbhabhishekam is part of the consecration ceremony in a
Swami Tejomayananda of Chinmaya mission explains the Kalasha after Kumbhabhishekam –
A person approaching the temple from a distance is able to see the Kalasha on top, but he or she enters the temple first to worship the personal form of the Lord inside. Subjectively, this means that from a distance we see the highest goal we want to attain – the formless, nirguna Brahman – but in order to reach there, we must go through the practice of worshiping the saguna aspect of the Lord. Thus the path for the spiritual aspirant is indicated. Through worship of the Lord (with attributes), we reach the highest, formless Brahman.
You may also like to read