Running a Pair Go tournament is now much easier because they are now supported in the latest release of GoClubsOnline (http://goclubs.org). Once a club starts to offer the tournament for online registration, players can sign in for the tournament, then form a team or join an existing team. For handicap Pair Go tournaments, and prior to pairings, TDs can evaluate the average Entering Ratings that are automatically calculated by GoClubsOnline to supply an appropriate Team Entering Rating. TDs can also manage all aspects of the teams, adding, editing, assigning players or deleting teams as necessary.

(partial screen shot from Edit a Pair Go Team Profile)
Once all team members are checked in, the TD can automatically generate pairings between the teams at the click of a button. Bands, Banned Pairings, Results, etc. can all be managed and reported by team just like a regular tournament. (The only real difference being that Rengo tournaments are always unrated.)
For more information and excellent documentation see http://goclubs.org/home.html.