Astro DataSci Group Meeting: We all get together, one person presents what they are working on, and they get some help / ideas etc. ★★★★★★★★★★
Workshop: One person presents something they are working on, but the focus is to actively give crit and rework it -- more hands on than above ★★★★
Consensus Projects: We get together and cook up / propose some consensus data science projects. We then work on them as a group with the plan of publishing actual astronomy papers ★★★★★★★
Visualization: A meeting a lot like NYCastroML, but focused on data visualization ★★★★★★
Gaia: A gathering to work on methods with Gaia data ★★★★
Just get together and work ★★★★★★★
Challenge: In the model of Adrian's successful data challenge, one person is chosen to present a challenge in data analysis each week (perhaps with a hidden "right answer") and we work together or in small competing teams to solve it ★★★★★