Psycho Whats? Diversity - SoCraTesUK/socrates-uk GitHub Wiki
Categories (like meyer-briggs, 4 colours, etc) have been debunked but can still be a useful starting point for the discussions. If it's too complicated for people to talk about themselves, you can do this with celebrities/politicians first. It's helpful for people to write their own "how-to" interact with me to make preferences explicit.
Check your own biases: https://implicit.harvard.edu/implicit/
Tackle your own biases: http://www.lookdifferent.org
This can be done in an async fashion by individual, rather than organising a training with everyone.
Explore the existing biases: https://ritholtz.com/2016/09/cognitive-bias-codex/
For example, could randomly pick a single one per person to go research and present back to the team.
Step-by-step making a company more inclusive: https://projectinclude.org
One team did introductions using skittles: each colour had a theme (travel, food, working habits) and each member was invited to picked one in turn and share their experience on the theme.
Maybe this can happen at a smaller scale by adding a question at standup / regular meeting?