Basics of Handling Disagreements with People

Workshops: 
https://deepcanvass.org/ organizes introductions to Deep Canvassing regularly. My personal take is that the workshop is great, but I don't find it entirely aligned with a truth-seeking attitude (it's not appalling either), and I would suggest rationalists to bring it their own twist.
https://www.joinsmart.org/ also organizes workshops who often vary in theme. Same remark as above.
There is a discord server accessible from https://streetepistemology.com/, they organize regular practices sessions. 
Motivational Interviewing and Principled Negotiation are common enough for you to find a workshop near where you live, I guess.

There's also the elephant in the room -my own eclectic workshop, which mostly synthesizes all of the above with (I believe) a more rationalist orientation and stricter ethics.

Someone told me about people in the US who trained on "The Art of Difficult Conversations", I'd be happy to have someone leave a reference here! If you're someone who's used to coaching for managing disagreements, feel free to drop your services below as well.

Thank you for this article! I found it helpful and very clear.