Wales' regional rugby double-header 'Judgement Day' has been confirmed for Saturday, 25 April with back-to-back derbies being staged at the Millennium Stadium for the third year running.
Cardiff Blues face Ospreys in the Pro12 at 14:30 GMT, followed by Newport Gwent Dragons against Scarlets at 16:45 GMT.
The event has been confirmed for the next six years under the Rugby Services Agreement, signed in August 2014.
BBC Wales plans to televise the first game and S4C the later match.
Judgement Day counts as a home fixture for Blues and Dragons, with season-ticket holders from both regions getting free entry.
Ticket prices have been slashed to £10 a head after the attendance fell from 36,000 in 2013 to slightly more than 30,000 last year.
Blues director of rugby Mark Hammett said: "Judgement Day will see all the best players in Wales under one roof and both games should be fantastic spectacles.
"I really enjoyed the festive derby games between the regions where we saw big crowds and games full of passion and intensity."
Dragons head coach Kingsley Jones added: "I am sure that playing at the Millennium Stadium is an ambition for many young Welsh players.
"So Judgement Day is a great opportunity to fulfil that ambition whilst playing for their region."