What's on Events Clay Play Dates: 19 – 21 August, 26 – 28 August What can you make out of a portion of clay? Explore the outdoors at Wheal Martyn to forage for fallen leaves, stones and sticks and see if you can make a Cornish piskie, a clay face, a little plate or something else entirely! Creative self-led activity. Pick up your portion of clay from reception! Time: 10am-4pm Small charge of £2 for cost of materials. Museum admission still applies.