The celts celebrated this day as an ysbrydnos (or 'spirit night'), when the veil between the human and spirit worlds was at its thinnest. These days it brings folk musicians out to haunt local pubs.
Homemade jams, chutneys and cakes will adorn the stalls through the town, as well as delicious fudge, succulent smoothies and delightful crepes. Visitors will be hard pushed to avoid the temptation of tasting.
Find out more about Caerphilly Food Festival
11 – 13 May
Three days of music showcasing 200+ bands using 20 stages. There's no place like Wrexham during FOCUS week.
Find out more about FOCUS Wales
To build upon the legacy of the Dylan Thomas 100 Festival, Dylan Day was created. A new annual day of celebration in the name of Wales’ most famous literary son. It marks the date Under Milk Wood was first read on stage at The Poetry Centre in New York in 1953. There will be performances, online happenings, walking tours and much, much more.
Find out more about Dylan Day
19 – 21 May
The Welsh Highland Railway Society’s Real Ale Festival, Rail Ale, will comprise an eclectic mix of a fine selection of real ales and ciders, combined with a variety of music, fine food and of course steam hauled trains.
Find out more about Welsh Highland Railway's Rail ale
20 – 21 May
Come along to Caldicot Castle and visit the Cookery Theatre, the Producer's Market and the Children's quarter. The chefs will demonstrate dishes from fine dining restaurants to top quality pubs.
Find out more about Monmouthshire’s Food Festival
20 – 21 May
A swim surrounded with mountains, a bike course in the heart of the Snowdonia National Park and a run through an awesome slate quarry. There are three race options delivered over two days; the Slateman Sprint and Mini Sprint and the Slateman Full. The Slateman Savage also returns for those who are tough enough to tackle the whole Slateman weekend by completing the Sprint AND the Full. The race venue is the village of Llanberis at the foot of Snowdon which will also include the Anglesey Sandman Tri and Snowman Winter Tri.
Find out more about the Slateman Triathlon
Yet another chance to explore the natural beauty of the Snowdonia National Park, albeit at pace. The Half Marathon is a loop of just over 13 miles that begins and ends in the small town of Llanrwst.
Find out more about Snowdonia Half Marathon
22 – 30 May
Some of Britain’s top cyclists making a rare appearance in Mid Wales. Includes town centre criterium racing, downhill mountain biking and a mass participation ride - the Continental Welsh Wild West Sportive, covering all the best roads in Ceredigion. The flagship event is the televised 'Tour Series' professional race to the famous promenade. Festival visitors can watch the all the on and off road action and also experience the beautiful and undiscovered lanes of Ceredigion on their own bikes.
Find out more about the Aberystwyth Cycle Festival
25 May – 04 June
The Hay Festival in Wales is a gathering in the staggering beauty of the Brecon Beacons National Park, which has brought together writers from around the world to debate and share stories. The Hay festival, founded in 1987, celebrates the written word attracting all types of writers from poets and scientists, lyricists and comedians, filmmakers, novelists, politicians, environmentalists and musicians to inspire, delight and entertain.
Find out more about the Hay Festival
Why not have a go and see how far you can bounce your stone across the water. The official world record is 88 skips. Beat that.
Find out more about the Welsh Open Stoneskimming Championships
29 May – 03 June
This year’s Urdd National Eisteddfod will take place in Bridgend, Taff-Ely. The Urdd National Eisteddfod is one of Europe’s largest youth touring festivals that attracts around 100,000 visitors each year. Over 15,000 children and young people will be competing during the Eisteddfod week in various competitions such as singing, dancing and performing. There is plenty of attractions for the whole family at the Eisteddfod from enjoying the competitions, to visiting the various stalls and exhibitors on site.
Find out more about the Urdd National Eisteddfod