World Rugby has announced the match official appointments for the forty matches that comprise the Rugby World Cup 2019 pool stage (link).
Nigel Owens will referee the opening match when Japan play Russia at the Tokyo Stadium on 20 September.
There is an official list of all the appointments for the pool games (link).
There is a list of the twenty-three officials selected to officiate at the 48 matches at Rugby World Cup 2019 (link). There are twelve referees, seven assistant referees and four television match officials that represent nine nations.
Tokyo Stadium (World Rugby)