Capture what is already arriving
Keep questions, observations, partial ideas, and useful examples in a place you can revisit. A small collection gives you material when the familiar answer has stopped moving.
Capture is not a demand to make every note useful. It is a way to keep a promising thread available long enough to develop it.
Broaden inputs and shape the surroundings
Look outside the usual subject, team, or format. An unfamiliar example can loosen an assumption and give people another way to frame the challenge.
Then change the conditions in the room: use a different prompt, write alone before discussion, introduce visuals, or move ideas between pairs. The goal is to make space for a wider range of contributions.
Use challenge to develop and test
Constraints, improvisation, and a well-framed question can make an idea more specific. Ask what would need to be true, what a smaller version would look like, or how another group might approach the same problem.
Choose one small test with an owner and a question to answer. The test turns a possibility into information without requiring the team to commit to a full solution.