We finally got fully ready to pull the #GaiaSprint trigger. We expect to pull it tomorrow. This will be a meeting in Heidelberg, and another in New York City (at the brand-new Simons Center for Computational Astrophysics), both to occur after the Gaia First Data Release. The idea is that is not a traditional meeting but more like a hack week, intended to facilitate exploitation of the new data. I also spent some time writing in our MCMC tutorial.