Welsh rugby fans have been celebrating all weekend after their team won the Six Nations trophy, but the party isn't over yet!
Top bosses at the Welsh Assembly and Rugby Union have decided fans should get another chance to mark what they called Wales' "wonderful victory".
But they're still trying to decide what the celebration should be.
The last time Wales won the Grand Slam, in 2005, Cardiff's Millennium Stadium hosted a huge bank holiday party.
About 20,000 fans were joined by the team and the Prince of Wales and Duchess of Cornwall in the stadium.
Wales won the Grand Slam and the Six Nations Championship with a 29 points to 12 victory over France at the Millennium Stadium in Cardiff on Saturday.