I am collaborating with multiple people on a project. I just found out that one of my collaborators is presenting the work (which is still in progress) on a major conference in my field. I feel like this should have been discussed first (and I would have also liked to be the one to present). Is it usual that this is done without discussion? Is it just the first one that organizes a talk that gets to give it? (We also were still somewhat secretive about discussion the ongoing project since we believe they will be quite a breakthrough so it comes as an additional surprise.) I guess I should have started the discussion on how we will present our work earlier.
Generally speaking, people should check with their collaborators before presenting joint work, including work in progress that may be controversial. An exception might be an individual invitation for work that has been published and presented previously.
Certain fields, like particle physics, often have very large collaborations, and they usually implement very formal procedures for deciding who gets to represent the collaboration at what conference, and what official material can be presented.
If you don't have a formal mechanism in place, you're right it's probably good to chat with your colleagues in advance to set the ground rules.