The lively and vital city of Derry jazz and big band festival is on again in a couple of months. Erstwhile punkabilly star the golden-voiced Imelda May is the headliner (30 April, International Jazz Day, Millennium Forum). The Derry festival has lots of music that isn’t jazz at all and that is of course healthy because jazz in its plurality as opposed to any misplaced sense of it as a music of the margins does not exist in a vacuum and thrives along parallel and often intersecting lines musically and culturally. And the festival is accessible to all with lots of free and reasonably priced events adding to the overall craic and joie de vivre. The main programme hasn’t been unveiled yet. Expect some vintage vim and vigour and, while you're at it, hi, a bit of pure terpsichore, Throwback time machine: 2014 and 2015 

Foyle Maritime Festival