Sesiwn Fawr Dolgellau is a world music event held in the town of Dolgellau in Wales. The event was established in 1992 by Ywain Myfyr, Huw Dylan Owen, Esyllt Jones, Elfed ap Gomer and Alun Owen, and was held in the town's streets. From 2002 until 2008, Sesiwn Fawr Dolgellau was held on the Marian Mawr, a large grassy area next to Afon Wnion. It was during this period that Sesiwn Fawr reached its peak audience figures with sell out crowds of approximately 5,000 attending each year. In 2007 and 2008, the festival was blighted by bad weather resulting in poor ticket sales, and as with a number of Welsh festivals, there was no Sesiwn Fawr in 2009.