Hmm, the next free day for me will be April 30th. It's called Queen's Day here and it's the birthday of the mother of our current Queen. As our current Queen has her birthday on January 31st, they decided to leave it on April 30th, because, generally, the weather is much nicer in April
Oh wait, Easter is before that, naturally and we have the second easter day off (the monday after Easter Day) and that would be April 13th.