Brecon Jazz Festival
Annual festival which takes place in the Powys market town every August
www.breconjazz.co.uk
Abergavenny Food Festival
Annual food festival.
http://www.abergavennyfoodfestival.com/
Royal Welsh Show & winter fair
The biggest agricultural event in the Welsh calendar.
http://www.rwas.co.uk/
Hay Festival
World famous literature festival in Hay-on-Wye, a town renowned for it's book shops.
http://www.hayfestival.com/wales/
Llandrindod Wells Victorian Festival
The leading Victorian Festival in the UK
http://www.vicfest.co.uk/portal/default.aspx
Crickhowell Green Man Festival
Alternative music festival set in the rolling parkland of the Glanusk Estate.
http://www.thegreenmanfestival.co.uk/