The Blues take on the Ospreys and the Dragons face the Scarlets on Saturday 30 March for the first of a new annual rugby initiative at the home of Welsh sport.
Cardiff Blues season ticket holders do not need to purchase a ticket as the match is included in their season ticket package. Season ticket holders will receive equivalent category or better tickets in the Millennium Stadium, which will be posted out to you as soon as they have been received by the WRU.
Season ticket holders will receive further information on where their seats will be located by the end of October.
Rugby fans can get their tickets priced at £10 for U18s, £25 for adults and £50 for a family of four (2 adults, 2 children)
Tickets can be purchased through Ticketmaster (08442 777 888) Ticketline UK (02920 230130) WRU.CO.UK and through the Cardiff Blues website from Monday.