Last Sunday (August 1st) I walked to Oi Pier Central Seaside Park. At that time, the men's hockey quarterfinals were played at Oi Hockey Stadium in the park.
Sadly, I have not seen anything about hockey games there. Spectators cannot enter the stadium at this Olympic Games. And we are not allowed to enter the area around the stadium, also.
Every entrance to access the stadium were blocked by walls.
It is not allowed to enter the red zone in the above. The red square with the arrow is the main stadium.
Many policemen guard the park to keep visitors out. Those policemen are sent from Shiga prefecture police and Kagoshima prefecture police (both are far from Tokyo).
It looked like a military base, or a maximum security lab.
I took some photos at the following points.
Below is Point A, supposed to be the entrance for spectators
It was the day of men's quarterfinals.
Point E: That is not the main stadium, but a track
Point F: Side road, very quiet
Please spread it to the world.