I wonder if it would be productive to have a hackathon to work together towards a common goal. For example, I could imagine working together to build a community germline database and appropriate software tools, such as an API. We could also have short talks to break up the coding.
@dooley pointed out that Mozilla is good at organizing open meeting-like events, and you can see some of the material they have put together at http://mozillascience.github.io/working-open-workshop/ .
This could be organized as an informal satellite event before or after a conference. As a concrete proposal, for example, perhaps there is a critical mass of people coming to the Immune Profiling in Health and Disease conference in Seattle in October? Or perhaps one of the Keystone conferences next Spring? Remote participation to the hackathon would be encouraged.