The first is 'Measuring and Evaluating Outcomes in Practice', with a really good line up of speakers and sessions. It's on 24th May in London and 29th May 2012. Here's the whizzy discount code!
The second is a bit further away, in time and space: 13th June, in Exeter, organised by the South West Forum. Again, a good looking line-up of speakers and workshops with a practical focus. More info on the conference is http://www.southwestforum.org.uk/south-west-forum-conference-proving-your-impact-exeter.