Dolphin and Nenagh Ormond will meet in an all-Munster Division 1B promotion/relegation play-off final next Saturday, while Armagh needed extra-time to see off Wanderers' challenge and the Division 2B play-offs were both won by the away teams, Rainey Old Boys and Tullamore.
Six promotion/relegation play-off semi-finals take place in the lower divisions of the Ulster Bank League this weekend, with three of them in Cork where Highfield, Dolphin and Sunday's Well will be looking to extend their seasons.
There are four heavyweight contenders in the Division 1A semi-final line-up, with Lansdowne and Clontarf, who have shared the trophy over the last four years with two wins each, facing off against Bateman Cup kingpins and last season's beaten league finalists Cork Constitution and Young Munster who have reached this stage for a third year in a row.
The quartet of clubs all looking to secure the final place in Ulster Bank League Division 1A next season include Garryowen, the second-from-bottom finishers in the top flight, their Limerick rivals UL Bohemians and Leinster duo Old Wesley and Naas.
It is all about knock-out rugby this weekend and there will be IRFU referees involved up and down in the country in the Ulster Bank League play-offs, as well in France in the European Rugby Challenge Cup semi-finals.
The Ulster Bank League has new champions in four divisions today - congratulations to Buccaneers, Banbridge, Greystones and Navan, and commiserations to those who ran them close, and the clubs who have suffered relegation. For others, the play-offs over the next few weeks will define their seasons.
The Ulster Bank League's regular season climaxed in typically thrilling fashion this afternoon as Banbridge, Greystones and Navan joined Buccaneers as promoted title winners, and the the Division 1A semi-final match-ups were confirmed - Lansdowne v Cork Constitution and Clontarf v Young Munster.
The finishing order of the top four in Ulster Bank League Division 1A will be sorted out come shortly after 4pm tomorrow, while there is a huge amount riding on the result of Dublin University v Terenure College as both sides look to avoid the relegation play-off spot.
Buccaneers will be officially crowned Division 1B champions at Dubarry Park tomorrow afternoon, while Galwegians and Dolphin are the clubs under most pressure in a relegation battle that is sure to go right down to the wire.
Banbridge's greater propensity for picking up bonus points has them in the box seat - but only just - as Daniel Soper's table toppers and second-placed Highfield both look to win the Division 2A title with away wins in the final round.
It is another straight shoot-out for league glory in Division 2B as Greystones head into the final round with a one-point lead over Armagh. The leading pair are both at home tomorrow, while there is a three-way battle between Skerries, City of Derry and Bective to avoid the relegation play-off spot.
Either Navan or Sligo will be crowned Division 2C champions at Balreask Old tomorrow. The Meath men are looking to complete an historic week for the club, while second-placed Sligo are chasing silverware just a year on from nearly dropping down to the junior ranks.
A massive weekend lies ahead in all five divisions of the Ulster Bank League with divisional titles, semi-final and play-off line-ups and relegation to be sorted out. Get down to your local club and support your team in the final round of the regular season.
UCD hosted Dublin University in Ulster Bank League Division 1A on Friday, and the game at Belfield had added spice as it doubled up as the annual Colours clash. Irish Rugby TV live streamed the game on Facebook, with Gordon Black and Dermot O'Mahony providing commentary.
Old Belvedere have been relegated from Division 1A after losing to Garryowen this afternoon while, with only a point now separating them, the top four clubs will all chase a home semi-final in next Saturday's final round. In the Round Robin Series, Malahide's second bonus point win means they have gained promotion to the Ulster Bank League for 2017/18.