Question your Westminster Parliamentary candidates!

For full details of various events for all ages, go to www.sciencefestival.co.uk.

Night-time celebration of Summer's return: drumming, fire, Green Man, May Queen, semi-naked pagan revival. Bad place to drop a contact lens. Good opportunity to meet the friendly and welcoming people of Calton Hill. Tickets: £8 on 30 April, £6 in advance from The Hub, Ripping Records, Forest Cafe. Booking fee 50p. Waterloo Place gates open at 7.30pm.

A free Circus skills event for children, to raise money and awareness for Edinburgh Direct Aid. (See 'Breaking news', 6.4.10). Strangebird Zirkus will star.

Gifts, jewellery, home baking, tea, coffee and huge quantities of soup.

Edinburgh Stop the War and Scotland Against Criminalising Communities are jointly organising a hustings.

Dr Hasan Beg will talk on 'Travels through Iran: Travel-log of a Scottish Traveller'. The event is free and refreshments wil be available afterwards.