Santhi Kalyanam
The god consort is taken as a metaphor for the "jivatma", the individual Self. The Lord is the paramatma, the total Self. The jivatma gets deluded by moha (as Sita did when aspiring for the golden deer) and gets separated from the paramatma. Further, the jivatma suffers from the tyranny of the ten sense organs which go haywire (as symbolized by Ravana) and gets imprisoned in the ocean of samsara.
To restore the jivatma back to its rightful owner- the paramatma, we need an acharya, a guru. Hanuman in the Ramayana symbolizes the guru who helps the jivatma to again unite with the paramatma.
The union of the divine couple can be taken as a symbolic union of the jiva and the paramatma. The Kalyana Utsavam can be interpreted on these philosophical lines as well. Adi Shankara in the Atma Bodha and Sadashiva Brahmendra in the popular song "khelati mama hridaye" have interpreted the union on these lines.