These are the dates for the 5nations tournament in 2010:

April 10th and 11th: Wuustwezel (BEL)
May 1st and 2nd: Vertus (FRA)
May 29th and 30th: Trier (GER)
June 12th and 13th: Cadier en Keer (NED)
August 28th and 29th: Esch sur Alzette (LUX)