Archery competitions are supposed to be held in Dream Island Park Archery Field.
You can go there by subway Yurakucho Line.
Get on a subway bound for Shinkiba, “新木場” at Toyosu station, “豊洲” then get off at final stop Shinkiba station. The subway stops 1 station before arriving at the destination. It takes around 5 minutes and costs 170 Yen.
The center is to the north of the station.
It takes about 7 minutes on foot from the station.