Do I detect Severn is a clue? If you are looking at the area of the river

Have a look at cresby.com festivals there are a few possibilities. Not all festivals have posted this year's dates but follow any links. Right in the middle of the window is the Tredegar House Festival. And if you are notching-up canals the Mon-Brec is right in that area.

If it is clubs and session try my pages on that subject. I assume you have transport.