The deceased are Narayan Khadka, 50, and Som Bahadur Tamang, 16, of Dhorthali-4, according to District Police Office.
The injured are being treated at Sadabahar Hospital in Khadichaur.
Two Nepal Army soldiers electrocuted to death in Chitwan
The meeting is believed to have been postponed in view of the ongoing First General Convention of the ruling Rastriya Swatantra Party.