HowtheLightGetsIn Philosophy & music festival Hay on Wye, mid Wales 21 May - 31 May 2015
The Hay Festival World famous literature event Hay on Wye, mid Wales 21 May - 31 May 2015
Color Festival A festival which brings together UK and International DJs. Bags of powdered paint are thrown in the air, making it a very colourful event Cardiff 6 June 2015
Gower Walking Festival With a range of walks and events
Gower, south west Wales, one of Wales' Areas of Outstanding National Beauty
6 – 21 June 2015
Access All Eirias Live music in the Eirias Stadium in Colwyn Bay Colwyn Bay 7 June 2015
Gregynog Festival The oldest extant classical music festival in Wales. Set principally in the beautiful countryside of rural North Powys, with performances by the world's leading musicians in intimate historic locations. There's an annual theme rooted in the cultural heritage of Gregynog and of Wales. Gregynog Hall, Tregynon, nr Newtown, Powys
plus Llandinam, Llafylin, Montgomery, National Library of Wales, Aberystwyth, National Museum Cardiff and Powis Castle.
12 - 28 June 2015
X Music Festival
A two-day music festival taking place in Bute Park featuring world famous artists
Cardiff 12 and 13 June 2015
Summer in Singleton A midsummer night’s dream line-up is in store for Singleton Park, Swansea on the longest day of the year, as international stars Alfie Boe, Rebecca Ferguson, Collabro and Sophie Evans take to the stage. Singleton Park, Swansea 21 June 2015
Sesiwn Fawr Dolgellau (the Big Session) Weekend of Celtic bands, rock, pop & beer Dolgellau 17 - 19 July 2015
Gower Festival Music from around the world including China, Croatia, Denmark, Germany, Israel, Italy, Japan, Poland, Russia and Slovenia Gower, Swansea in a variety of settings 1- 12 July 2015
North Wales Bluegrass Music Festival International Bluegrass Bands from America and Europe and British Bands play in 8 concerts over the 4 days. Workshops and tuition in Banjo, fiddle dobro, bass and guitar. 24 hour pickin sessions on festival site. Conwy, North Wales 2 - 5 July 2015
Hijinx Unity Festival Five days of performances showcasing some of the best inclusive and disability arts from around the world.
Performers from Mozambique, France, Germany, Belgium, Italy and aross the UK will perform in Cardiff’s vibrant City Centre and at the prestigious Wales Millennium Centre
Cardiff City Centre and
Wales Millennium Centre, Cardiff Bay
1- 5 July
Tafwyl Welsh language festival in our capital city Cardiff, south east Wales 4 & 5 July 2015
Cardiff International Food Festival Sample local, national and international food & drink, enjoy demonstrations and live music Cardiff Bay 10 - 12 July 2015
Wales National Air Show The Red Arrows, two Spitfires, a Lancaster and Eurofighter Typhoon are including in the show. Swansea 11 - 12 July 2015
BNB Festival A week long Art and Heritage Festival Brynmawr, Blaina & Nantyglo, Upper Ebbw Fach area 11-19 July 2015
Lampeter Food Festival Food festival in the Lampeter campus of the University of Wales Trinity Saint David Lampeter 25 July 2015
The Big Cheese A free weekend festival packed with entertainment, music, food and drink Caerphilly town centre, south east Wales 24 - 26 July 2015
Monmouth Festival Music festival featuring dance, classical, country, folk, jazz, pop, rock’n roll , ska, world music and so much more. The festival features a carnival, Busking Festival and a growing Fringe. Throughout the town of Monmouth 24 July - 1 August 2015
Brecon Jazz Festival International festival attracting the top names from the world of jazz Brecon, south east Wales 7 - 9 August 2015
Cardigan River & Food Festival Local produce including rare breed meat and award winning cheeses plus cooking demonstrations and a full programme of river events. Cardigan, south west Wales 8 August 2015
Glass Butter Beach Festival A music, action sports and beach lifestyle festival in Abersoch on the Llyn Peninsula Abersoch on the Llyn Peninsula 12 - 15 August 2015
Solarsphere Astronomical & music festival A brand new event combining the science of astronomy with the backdrop of a "music festival". Builth Wells, mid Wales 14 - 16 August 2015
Pride Cymru A parade through the city centre, followed by live music, funfair rides, a family zone, a cultural market with arts & crafts, food & drink in Cooper's Field. Cardiff 15 August 2015
Conwy River Festival Festival of watersport and sailing with extensive on shore activities, entertainment and events. Quay Marinas, Conwy, North Wales 15 - 22 August 2015
Green Man Festival An alternative folk festival in the Brecon Beacons Glanusk near Crickhowell, south east Wales 20 - 23 August 2015
Presteigne Festival Music and arts festival Presteigne, Powys on the Herefordshire/Powys border 27 August - 1 September 2015
Strangely, that listing didn't include the eisteddfodau .. the big one this year is still to come .
1-8 August.....Montgomeryshire and the Marches National Eisteddfod, held at Meifod.
There are loads loads of local ones which I'm having a bit of trouble tracking down ...