Chofu City Fireworks Festival happens on the grassy banks of the Tama River (downstream from the bridge on the Keio Sagamihara Line). The opening ceremony begins at 6pm and the explosions start from 6:30pm.
Despite being a lesser-known festival, the organizers aren’t skimping on the number of fireworks. 10,000 individual fireworks will go up in flames in front of an estimated audience of 35,000 people.
The nearest stations are Keio Tamagawa Station (5-minute walk) and Chofu Station (20-minute walk). Note that the event will be cancelled if it’s stormy.