In 2009 the Gallery organized the first edition of the Kathmandu International Art Festival (KIAF 2009), which saw the participation of over a hundred national and international artists. The festival was conceived as a mega art event which would be held every three years and was centered on socially aware art practices that were inspired by critical socio-political issues of the time. KIAF 2009 was led by artistic director Sujan Chitrakar. The artworks under KIAF were exhibited simultaneously across multiple locations in the city.
In 2009, the Gallery collaborated with the Australian Himalayan Foundation to provide scholarships to up and coming artists. In 2011, the Siddhartha Arts Foundation was registered as a nonprofit to conduct the KIAF and to train the next generation of arts managers and leaders.
In 2012, the second Kathmandu International Art Festival was held with the theme “Earth | Body | Mind”. Sharareh Bajracharya served as the Festival Coordinator.
In 2017, the third iteration of KIAF, now called the Kathmandu Triennale, was held with Phillipe Van Cauteren as the curator. With the city as the theme, the Triennale featured over 70 artists from 25 different countries. Siddhartha Art Gallery was one of the venues for the Triennale exhibition.
In 2017, the Gallery also collaborated with the Himalayan Light Art Award and Shakti Art by Women to provide additional support to talented young artists.
The Gallery has organized book launches, poetry reading, lectures, musical concerts, and fundraising events alongside its exhibitions. Over the years, Siddhartha Art Gallery has donated Rs.30,000 to the Red Cross Earthquake Relief Fund, Rs.50,000 to the renovation of the Krishna Mandir in Patan, Rs.10,000 towards the construction of the Maternity Ward for underprivileged mothers in Prasutigriha Hospital, Rs.7,000 to the Ganesh Foundation for cleft palette surgery, Rs.10,000 towards the renovation of the Tumbaha Narayan Temple in Patan, and Rs.65,353 to Shree Nepal Rashtriya Madhyamik Bidyalaya, Dumwara, Bahra—a school for the visually impaired.
The Gallery has conducted programs in/with the National Association of Fine Arts, the Arts Council, Patan Museum, Kathmandu University Department of Fine Art and Design and has also conducted several art projects in various hotels: Hotel de l' Annapurna, Everest Hotel, Soaltee Oberoi, Hyatt Regency, Bhanchaaghar, Imago de' Gallery and Café Mitra. The Gallery also has some publications to its credit: Khulla Dhoka, Nirantar Khulla Dhoka, and a volume of poems by the poet Buddhisagar, Rajya Laxmi Rana. With stress on quality, Siddhartha Art Gallery offers its service - in evaluation and restoration - to serious collectors and buyers of the contemporary Nepalese art. 'Investing in Creativity'- is the Gallery's motto.