The NumFOCUS DISCOVER Cookbook (Diverse & Inclusive Spaces and Conferences: Overall Vision and Essential Resources). A guide for organizing more diverse and inclusive events and conferences, produced by the NumFOCUS Diversity & Inclusion in Scientific Computing (DISC) Program, with support from the Moore Foundation.
https://medium.com/@anna.sarai.rosenberg/respectful-collection-of-demographic-data-56de9fcb80e2
Some great information and suggestions!