Both Garba and Dandiya Raas are Gujarati folk dances that are characterized by circular dancing around an earthen-ware lamp.
According to Wikipedia;

Garba is performed in a circle as a symbol of the Hindu view of time. The rings of dancers revolve in cycles, as time in Hinduism is cyclical. As the cycle of time revolves, from birth, to life, to death and again to rebirth, the only thing that is constant is the Goddess, that one unmoving symbol in the midst of all of this unending and infinite movement. The dance symbolizes that God, represented in feminine form in this case, is the only thing that remains unchanging in a constantly changing universe (jagat).

Garba Celebrations on campus are typically held during the Navaratri Celebrations.