The 6th annual conference of the British Society for the Psychology of Individual Differences will take place in York's Kings Manor on Friday April 10th, 2015. Further details are available here. I attended BSPID last year and thought it was a very friendly group of researchers with interesting talks. Registration fees are modest making it a good option for early-career psychology researchers interested in individual differences.
Abstract submissions "from any area of research with relevance to individual differences psychology" must be submitted by March 1st. See the above link for submission details.