Bihu
Bihu is the most important festival of Assam. It is celebrated with joy and abundance by all Assamese people irrespective of caste, creed, religion, faith and belief.Three Bihus are celebrated in a year: Bohag Bihu which augurs the wish for a good harvest because this is the time when farmers start sowing, Kaati Bihu which is observed to mark the cutting and binding of grains and Magh Bihu which marks the season of harvesting of grains.

Me-Dum-Me-Phi
The most important Ahom festival which deserves mention is the Me-Dum-Me-Phi, i.e., the ancestor worship festival which is observed by the whole Ahom community. This is performed annually on the 31st of January and helps to develop social contacts and community feelings among the Ahoms. Colourful processions with devotees in traditional finery are also taken out on the occasion.

Baishagu
Famous for its myriad colours and merriment, 'Baishagu' is generally celebrated by the Bodo Kacharis during mid April. It is the most cherished festival of the Bodo tribe. The Bodos also celebrate it as a springtime festival at the advent of the new year.

Ambubachi Mela
Is the most important festival of Kamakhya temple of Guwahati and is held every year during monsoon (mid-June). It is a ritual of austerities celebrated with "Tantric rites".During Ambubashi the doors of the temple remain closed for three days. It is believed that the earth becomes impure for three days. During this time no farming work is undertaken.Ambubachi mela is held at the Kamakhya temple, after being closed for the afore-mentioned three days. On the fourth day only the devotees are allowed to enter inside the temple for worship. Thousands of devotees from all over the country and abroad visit this mela.