Nepal's decade-long civil war claimed 16,000 lives and displaced 100,000 people.
The conflict was between Maoist rebels trying to overthrow the country's ruling monarch and the national army. There are allegations of human rights allegations on both sides.
The Maoists ended the conflict in 2006 under a peace deal with the government and won a general election in 2008.
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Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.
The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.