WALES. Centre for Alternative Technology, Machynlleth, Powys
Theatre and science workshops take children through Gaia theory or 'geophysiology' by exploring the Earth through the eyes of an imaginary physician. Topics include: why is our planet the only one in the solar system with life on it?; Is the Earth in a healthy condition?; If the Earth regulates everything, how does it do it? The project is supported by the Millennium Commission.Tel: 01654 703743.
SCOTLAND. St Ann's Community Centre, Cowgate, Edinburgh
Leicestershire Youth Arts, at the Edinburgh Fringe for the 19th time, are staging eight productions from August 17-29, including: 'The Wiz', 'Jungle Book', 'Little Shop of Horrors', 'A Midsummer Night's Dream', 'Cider with Rosie' and 'Across the Barricades' (a Belfast 'Romeo and Juliet'). Tickets: pound;3.50-pound;4.50. Tel: 0131 557 0469.
ENGLAND. Bath Shakespeare Festival
Plays, films and talks by the likes of Peter Whelan and Michael Bogdanov are being mounted by the Theatre Royal Bath and the English Shakespeare Company, August 18-30. Plays include: 'Antony and Cleopatra', 'As You Like It', Paula Vogel's 'Desdemona' and an extraordinary small-scale 'Richard III', played out in the nursery from hell. For nine to 11-year-olds, there is a performance project, 'Magical Midsummer Madness', and up to 50 local young people will spend three weeks rehearsing and four nights performing 'Storm on the Lawn', an original piece based on 'The Tempest'. Tel: 01225 448844.
Sudeley Castle, Winchcombe, Gloucestershire
The Festival Players are performing Shakespeare's 'A Midsummer Night's Dream' in the open air, August 15-16. Tel: 01242 602308.
Farnham Maltings, Surrey
For Children's Week, August 17-21, sessions include: ceramics, photography, painting and printing, junk jewellery and mask-making. Among other activities are a circus skills workshop for eight to 12-year-olds, August 18; 'Make a Play in a Day' for seven to 11s, August 19; and children's music sessions, August 17. Tickets from pound;5. Tel: 01252 726234.
Museum of London, EC2
Children can meet 'real' Londoners from the past played by actor-interpreters, spend the afternoon with a Roman centurion and listen to the tales of a Victorian grocer's wife.Tel: 0171 600 0807.
The Old Royal Observatory, Greenwich, London SE10
On August 18, the Accurist Millennium Countdown Clock reaches day 500 in the countdown to the year 2000, and visitors will have the chance to follow a trail and claim one of 500 prizes. Other events include: costumed performances about the first Astronomer Royal and the Prime Meridian (the official starting point for the next millennium), planetarium shows and clockmaker demonstrations. Tel: 0181 312 6565 (24 hours) or 0181 858 4422.