Apart from the major religious festivals of Diwali, Christmas, Dussera, Holi etc., the diverse ethnic populace of the town celebrates several local festivals. The Lepchas and Bhutias celebrate new year in January, while Tibetans celebrate the new year ("Losar") with "Devil Dance" in January–February. The "Maghe sankranti", "Ram Navami", "Chotrul Duchen", "Buddha Jayanti", the birthday of the Dalai Lama, Loosong, Bhumchu, Saga Dawa, Lhabab Duechen and Drupka Teshi are some other festivals, some distinct to local culture and others shared with the rest of India, Nepal, Bhutan and Tibet.

A popular food in Gangtok is the "momo", a steamed dumpling containing pork, beef and vegetables cooked in a doughy wrapping and served with watery soup. Wai-Wai is a packaged snack consisting of noodles which are eaten either dry or in soup form. A form of noodle called "thukpa", served in soup form is also popular in Gangtok. Other noodle-based foods such as the chowmein, thanthuk, fakthu, gyathuk and wonton are available. Other traditional Sikkimese cuisine include shah-phaley (Sikkimese patties with spiced minced meat in a crisp samosa-like case) and Gack-ko soup. Restaurants offer a wide variety of traditional Indian, continental and Chinese cuisines to cater to the tourists. "Churpee", a kind of hard cheese made from cow's or yak's milk is sometimes chewed. "Chhang" is a local frothy millet beer traditionally served in bamboo tankards and drunk through bamboo or cane straws. Alcohol is cheap due to low excise duty in Sikkim. Beer, whiskey, rum and brandy are frequently consumed by both locals and non-locals.

Residents of Sikkim are music lovers and it is common to hear Western rock music being played in homes and restaurants. Hindi pop songs are also common. Indigenous Nepali rock, music suffused with a western rock beat and Nepali lyrics, is particularly popular. Football (soccer), cricket and archery are the most popular sports in Gangtok. The Paljor Stadium, which hosts football matches, is the sole sporting ground in the city. Thangka—a notable handicraft—is an elaborately hand painted religious scroll in brilliant colours drawn on fabric hung in a monastery or a family altar and occasionally carried by monks in ceremonial processions. "Chhaams" are vividly costumed monastic dances performed on ceremonial and festive occasions, especially in the monasteries during the Tibetan new year.

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