- Try to find a way to not go to the meeting. Anything you say, especially the most insignificant part, will be used against _someone_ in an argument that doesn't make any sense. You're going to feel the need to correct their misunderstanding and misuse of what you said. You might even try to re-focus the discussion back to the important thing you were _trying_ to say. It only goes down hill from there. You're better off interfacing with a group of C-level people through documents.

- 1:1 meetings can work. Make sure you can back up everything you say with data.

- You're a developer, you can't estimate time and effort for shit. If asked, say you'll get with your manager or the PjM or w/e to get a date.

- Find out from the person that asked you to join what you should be prepared to speak to.

- If there's an agenda or documents that will be discussed, read them before the meeting. Doesn't matter if they plan to read it during the meeting.

- No hemming and hawing. If you don't understand what you're being asked, ask for clarification. If you don't have an answer you're confident in, say so. If they insist, prefix your crisp and concise answer with your level of confidence. "In my experience.." "From what I've read.." etc.