The Pro14 will return from a five-month Covid-19 pandemic hiatus with derbies from 22 August.
Teams from the same nation play against each other home and away before the season is concluded via semi-finals and a final.
Those finishing in the top two places in Conference A and B will contest the semi-finals.
That final is scheduled to take place on Saturday, 12 September with the venue to be confirmed.
The remaining eight rounds of fixtures scheduled will not be completed, meaning the regular season will be cut from 21 games to 15.
Four consecutive weekends from the restart date have been earmarked to conclude the campaign.