The ACCU, which is an organisation of professional programmers, are holding their annual conference in Bristol at the Marriott Hotel from the 9th to the 13th April. There are several Raspberry Pi sessions and here is a list of them:

• 9th – Hardware for Softies tutorial: Physical computing with the Raspberry Pi (Romilly Cocking / Steve Freeman)
• 10th – Inspiring future generations with open hardware – the Raspberry Pi – day 1 keynote from Eben Upton.
• 10th – The Actor Model applied to the Raspberry Pi and the Embedded Domain (Omer Kilic)
• 10th – Test driven development on the Raspberry Pi (Marc Evers / Rob Westgeest / Willem van den Ende)

More information and registration details can be found on the ACCU website. I think registration is free.