Hahan has participated in numerous group exhibitions in Indonesia and abroad, including the 7th Asia Pacific Triennial, Queensland Art Gallery/Gallery of Modern Art, Brisbane, in 2012. He has also collaborated in a range of collectives and bands, the best known of which is the art collective/rock band PUNKASILA, which he co-founded with Australian artist Danius Kesminas. PUNKASILA participated in the 8th Asia Pacific Triennial, Brisbane in 2007 and the Havana Biennial, Cuba, in 2009.