Celtica, Machynlleth, Powys Spinning and weaving demonstrations, July 24-26; clay pot-making workshop, July 27; and 30-minute Welsh language sessions, storytelling and Celtic costumes, July 29. All are free with admission ticket. Tel: 01654 702702.

ENGLAND

Castle Head Field Centre, Cumbria Backpacking and bivvying, badger watching, animal tracking, rock climbing and canoeing are some of the activities for nine to 16-year-olds on Discovery and Adventure courses, July 26-31 and August 2-7, 7-14 and 15-22. Fee: around Pounds 135residential. Tel: 015395 34300.

Harrogate International Festival International symphony orchestras, dance, opera and theatre, July 24-August 8. Mini festivals include jazz, “Laffs at the Baths” comedy and street theatre. Tel: 01423 562303.

Cleethorpes Carnival, Lincolnshire Seashore snakes and ladders and treasure hunting at the Humber Estuary Discovery Centre, a model boat bonanza, carnival fancy dress and a Caribbean night are among the highlights, July 25-August 2. Tel: 01472 323222323111.

Nuneaton Museum and Art Gallery Free “Learn how to airbrush” workshop for 13 to 18-year-olds, July 25, where they can design a record or book cover or create fantasy art. Book on tel: 01203 350720.

Hever Castle, Edenbridge, Kent: Summer Festival Oscar Wilde’s ‘The Importance of Being Earnest’ is being staged at the Lakeside Theatre, July 29-August 8. Tickets: Pounds 10.50-Pounds 13.50. Tel: 01732 866114.

St Albans Museum Mad Hatter’s Tea Party with Victorian food and games, July 31, 3pm. Fee: Pounds 4, Pounds 3 Young Friends. Tel: 01727 819340.

Salisbury Museum Free admission on National Archaeology Day, July 25. Activities include: meet the archaeologists, family gallery trail, rare access to the conservation laboratories. Tel: Andrew Deathe, 01722 332151.

Tower of London, E1 Hands-on experience of archaeology for families, July 25-26, celebrating the re-opening of the Tower’s wharf and foreshore. Tel: 0171 488 56623.

Derby Museum and Art Gallery Music-making, modelling, comic images, making and flying kites and learning to crochet are among activities for ages four to 16. On August 5, stories from around the world. Tel: 01332 716654.

The Old Operating Theatre, Museum and Herb Garrett, London SE1 Witness the dread of the Victorian patient facing amputation without anaesthesia, August 6, 20 and September 3, or discover the medicinal uses of roasted vipers and baths of sheep heads, July 30, August 13, 27 and September 10. For ages seven upwards. Tel: 0171 955 4791.