Aberystwyth's Winter Market is held on Monday's from mid November. In 2018 this should be the 19th and 26th of November. It starts around 8:00-9:00am and goes on till around 8:00pm - often finishing earlier when the weather's bad. The current location for the market is along Park Avenue.
The Winter Market and Fun Fair are part of a tradition that goes back to the middle ages. In 1791 the Gentleman's Magazine and Historical Chronicle mentioned that: