For those still looking for something worthwhile to do this summer I recommend the following (click on links for detailed information):
Workshops on Research Design for Causal Inference
Northwestern University will be hosting two workshops this summer on Research Design for Causal Inference, sponsored by Northwestern University, University of Southern California, the Society for Empirical Legal Studies, and The Searle Center on Law, Regulation, and Economic Growth at Northwestern Law.
Causal Inference: Bayesian Methods Workshop
July 11-13, 2011
Causal Inference: Frequentist Methods Workshop
August 15-19, 2011