Nabin Dhungana, 19, and Sunil Shrestha of Nilkantha VDC-5, Dhadingbesi, died in the accident, the police said.
Sagar Pandey, who was also traveling in the same motorbike, was injured and is being treated in Kathmandu.
When will it end?
The event will take place at the National Assembly Hall on Exhibition Road, Kathmandu, and will focus on the manifesto unveiled under the leadership of party President Gagan Thapa.