The [Web4All conference](http://www.w4a.info/2019/hackathon/) in San Francisco is planning a hackathon around JupyterLab accessibility issues on May 15 and 16. Signup form is at https://docs.google.com/forms/d/e/1FAIpQLSfn4f-qdLHD4UQ0QeeJpHKul1KIcjGeamVyfSWSpBEqT8uR8g/viewform and closes April 30.