The total attendance for the Blues-Ospreys, Dragons-Scarlets double-header could easily top 70,000. With ticket sales already pushing towards 65,000, it is guaranteed to generate an attendance higher than at any Premier League football match on Saturday.
Taking the weekend as a whole, it will be second only to Manchester United versus Leicester City at Old Trafford on Sunday for what could be the final act of the Foxes' fairytale. Neither titles nor fairytales are at stake at Principality Stadium on Saturday which makes it all the more praiseworthy.
That Cardiff Blues and Newport Gwent Dragons happen to be the respective home teams on such an auspicious occasion can be interpreted as a suitable acknowledgement to a day long gone when, as plain Cardiff and Newport, they joined forces for a unique occasion.
On Saturday February 17, 1951 their match at the Arms Park drew a world record crowd of 48,500. It generated gross receipts of, wait for it, £2,587 and while that was an awful lot of money for the austerity of the time, it seems positively piffling compared to current prices.
''The great day has arrived,'' The Editor wrote in the Cardiff match programme of the day. ''Newport, our great and friendly rivals, visit the Arms Park unbeaten. The glove is down and we do battle with them for the honour of being the leading club side in Wales.
''It should be a great game. It will be a great occasion. We expect a record club gate, in fact, a world record for any match.''
65 years later and much the same sentiments can be said in respect of Saturday. In Guinness PRO12 terms, the Welsh will eclipse their own record for the competition of 52,762 on the last Judgement Day twelve months ago, overhauling the 51,700 for Leinster-Munster two years ago which stands on its own as the highest for a single match.
As for the Welsh reclaiming the world record, sadly that has gone and gone for good. The figure that stood unbroken for more than three decades from 1951 has been pushed far beyond Welsh reach by Saracens' 84,068 against Harlequins at Wembley last year.
For all four Welsh regions, Judgement Day will determine how many, or perhaps more relevantly how few, are passed fit for a top-six finish and qualification for next season's Champions' Cup.
The Blues, in eighth place one point behind Munster and Edinburgh, could make the top six provided a whole matrix of results go their way and they win their two remaining matches. The Ospreys will have something to say about that on Saturday afternoon.
Cardiff Blues celebrate their win at Judgement Day in 2014
The old Cardiff-Swansea tribalism will ensure a full-blooded contest as the Blues storm into the home straight on the strength of four consecutive wins. Ospreys, twice Grand Final champions, will view the challenge of beating their inter-city rivals in Cardiff as priceless local compensation for failing to extend their season into the play-offs.
If they do make it five-in-a-row, the Blues will sit back and hope the Dragons do them the almighty favour of denying the Scarlets the win that would ensure the West Walians qualify for the Champions' Cup as the highest ranked regional finishers.
Connacht will reclaim overall leadership of the table provided they win in Treviso on Friday night. A record ninth straight win for the Warriors, against Zebre at Scotstoun, would ensure the defending champions make a simultaneous leap into second place.
Whether they stay there going into the final round of matches next week depends on how Leinster cope with their trip north to Belfast on Saturday. Ulster dare not lose if they are to be sure of squeezing into the play-offs whereas a Leinster win, with Treviso at the RDS the following week, would surely guarantee them first place.
The last of the provincial duels provides what ought to be the outstanding tie of the weekend, first against fourth with the prospect of the ancient rivals doing it all over again in the play-off semi-finals in Dublin the week before the Guinness PRO12 Final at BT Murrayfield on May 28.
For sheer gut-wrenching tension nothing ought to surpass Friday night in Cork where Munster face Edinburgh - seventh against sixth in a showdown guaranteed to have a critical effect on the top six. Munster know what they have to do, win in Cork and win again in Limerick against Scarlets next week.
Anything less and Europe's premier knock-out event will go ahead next season without not just the team that has always been there since its inception 21 years ago. They would be without the province whose players and fans have done more for European rugby than any other.
The top four finishers since the introduction of the Guinness PRO12 play-offs:
Last season:
P W D L Points
Warriors 22 16 1 5 75
Munster 22 15 2 5 75
Ospreys 22 16 1 5 74
Ulster 22 14 2 6 69
Season 2013-14:
Leinster 22 17 1 4 82
Warriors 22 18 0 4 79
Munster 22 16 0 6 74
Ulster 22 15 0 7 70
Season 2012-13:
Ulster 22 17 1 4 81
Leinster 22 17 0 5 78
Warriors 22 16 0 6 76
Scarlets 22 15 0 7 66
Season 2011-12:
Leinster 22 18 1 3 81
Ospreys 22 16 1 5 71
Munster 22 14 1 7 67
Warriors 22 13 4 5 65
Season 2010-11:
Munster 22 19 0 3 83
Leinster 22 15 1 6 70
Ulster 22 15 1 6 67
Ospreys 22 12 1 9 63
Season 2009-10:
Leinster 18 13 0 5 55
Ospreys 18 11 1 6 52
Warriors 18 11 2 5 51
Munster 18 9 0 9 45
Most appearances in the play-offs (Maximum 6):
5 - Leinster, Munster, Warriors.
4 - Ospreys, Ulster
1 - Scarlets.
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