This first day of the festival will be on April 9. Visit Taumadhi square/Nyatapol temple at around 3pm. There'll be tug of war to pull the chariot on either side of the city which goes on up to midnight.
Next day in the morning the chariot is brought back to Gahiti which is close to Taumadhi where the tug of war started. On 12th April, the chariot will be pulled from Gahiti to Lesinkhyo where huge Lingo is erected. You should be around that area from 3 pm