The British Supercross Championship kick-started the Stadium's busiest month to date on 3rd December and was swiftly followed by the Noise and Confusion Concert featuring Oasis on 10th December and the WRU landmark 125th Anniversary Dinner on the 14th December.
The Blizzard Fun Park, which will last until 5th January, was opened by rugby star Ryan Jones on 15 December, and a series of Vegas style private functions has also filled the Stadium's evenings ever since - the bumper month culminates in the New Year's Eve "Heaven and Hell-themed" celebrations next week.
A grand total of 64,000 revellers partied hard at the Noise and Confusion concert, which also welcomed the Foo Fighters, Razorlight and the Coral the packed out Millennium Stadium.
A Welsh Rugby landmark was celebrated in the Millennium Royale Big Top Pavilion on the pitch area of the Stadium when more than 1,000 people celebrated 125 years of the Welsh Rugby Union.
The dazzling December was revved up by Supercross, the motor sport spectacle that sees 4000 tonnes of dirt cover the massive concrete pitch area of the stadium creating a unique race track, drawing in 12,000 fanatical spectators.
Next a Blizzard was forecast with a massive indoor funfair featuring indoor snow, toboggans, winter rides, roller-coasters and Santa Claus himself - currently welcoming over 1,000 visitors a day and set to break the 20,000 mark before it closes on 5 January.
'The Night it Snowed in Vegas', also at the Vegas themed Millennium Royale Big Top Pavilion, hosts a series of parties throughout December and so far 8,000 party-goers have enjoyed the likes of Elvis and his amazing showgirls, a cheeky spin of the roulette wheel or a dabble on the poker tables.
"December has been an incredible month so far, we have had a record number of events in the stadium in the space of four weeks and isn't over yet," said Millennium Stadium chief executive Paul Sergeant.
"The diversity of the events we've had is fantastic, from Supercross right through to themed dinner parties. We have a genuine open mind about what precisely the Millennium Stadium can be used for and I can honestly say we examine every possible use, no matter how far-fetched it may at first appear, and that policy has paid dividends this month."
Revellers wishing to join the dazzling December party at the Millennium Stadium can celebrate this magnificent month for Wales' iconic, internationally-renowned, multi-event, venue in style on New Year's Eve and bring in 2006 for the price of just £15 in the new Millennium Royale Big Top Pavilion. Tickets are selling fast with 3,000 gone already, remaining tickets are available online at www.millenniumstadium.com or from the ticket hotline 08705 582 582.
"This month's eclectic mix of events really shows how the Millennium Stadium as a building is the ultimate chameleon of venues and with the right preparation and organisation we can stage absolutely anything," added Alex Luff, Venue and Sales manager for Millennium Stadium, who was at the helm in bringing in this amazing schedule of events.
"We had a wicked start to the month and we will have a wicked end with the New Year's Eve 'Heaven and Hell' party, which is estimated to see another 8,000 party-goers become a part of the Millennium Stadium experience."
The Stadium's second busiest month was this November when the Welsh rugby side faced visiting teams from New Zealand, South Africa, Fiji and Australia on back to back weekends in Cardiff.
Principality Stadium will host the UEFA Champions League Final in six weeks' time. WRU chairman Gareth Davies, Football Association of Wales chief executive Jonathan Ford and Ambassador Ian Rush joined young sports fans at the trophy arrival at the venue to celebrate the magnitude of the event on Saturday 3rd June (kick-off 19.45).
British and Irish Lions captain Sam Warburton is looking forward to bringing together players from Ireland, Scotland, England and Wales for the biggest challenge of their careers - a series against world champions, New Zealand.
For the fifth year running, Wales referee Nigel Owens will be in charge of proceedings at Judgement Day V at Principality Stadium. It promises to be 'extra special' for the Wales' favourite ref, as he will be making his 150th appearance in the league.
There will be no shortage of inside knowledge from Bowl Finalists Caerphilly and Amman United when they face each other on Sunday at National Finals Day. Caerphilly hooker Rhys Cleverly knows the Principality Stadium pitch better than most as a matchday groundsman, while Amman United can look to Wales' record try scorer Shane Williams for some helpful advice.
Two hundred and 40 teams competed in the inaugural Urdd WRU 7s held at Pencoed last week with Welsh internationals Steff Andrews and Jasmine Joyce impressed with the talent on display, as was Urdd chief executive, Sioned Hughes.
The countdown is on for Judgement Day V as tickets for the big day at Principality Stadium soar through the 50,000 mark. Players and coaches alike are bursting at the seams to play in the double header with Dragons coach Kingsley Jones claiming there is a 'real buzz' about the event.
WRU TV went behind the scenes when the four regions got together to test their skill set for the BBC's Scrum V Live rugby show, at the WRU National Centre of Excellene in the build up to Judgement Day V. Blues' Matthew Morgan was one of the stars of the show while the Dragons' Cory Hill proved a surprise package...the full set of results will be revealed on tv screens on matchday
Wales assistant coach Richie Pugh is confident his side can cause a few headaches in the Hong Kong Sevens this weekend. In a tough group, Wales kick off their campaign against New Zealand on Friday before playing Japan and Fiji, who are chasing their third consecutive Hong Kong title, on Saturday.
Bedwas had to overcome a stubborn Carmarthen Quins side before winning the Foster's Challenge Cup final in Bridgend with a 23-18 victory. Bedwas captain Nicky Griffiths pays tribute to his side who have claimed the club's first piece of silverware in the modern era.
Team coach Brett Davey is aiming to keep his unbeaten run in cup finals at Principality Stadium intact when his side take on Amman United in the WRU Bowl final, after he guided Caerphilly to a 20-14 win against Cilfynydd in the semi-finals.
Penallta are hoping to go one step further than last season when falling to Bedlinog in the WRU Plate Final. After a titanic struggle against Nant Conwy, they have given themselves a great chance, after a hard fought 18-13 semi-final victory.