"We've been working on [De Gabay] over the last year in Butetown with the whole community" says National Theatre Wales Artistic Director John McGrath.
"A group of young Somali men came to us asking if we could help them tell their story in a very different way to the way it's usually told".
More top news
It will be a fine and dry day across the country with lengthy sunny spells.
England enjoyed a winning send-off to their Australia tour as they recovered from early problems leaving Wales floundering.
Veteran singer Sir Tom, 75, is gearing up for his first concerts since wife Linda died after a "fierce" battle with cancer in April.